As a Holley engineer once said, a carb will run better than a poorly tuned EFI (or something to that effect, lol). I have run blowthru carbs on an LS, ran flawlessly, one has been over 10 years on a car. Having said that, just curious if the OP has had it prof. tuned. Tuning can't overcome some mech. problem. I have built several cars, using several Holley systems, first time took me months to get it reliable, finally got help, lol.
Switching over to a carb needs fuel pressure reduced, using an FI pump would need an FI return reg. pretty much to reduce pressure to where a carb. reg could handle it. You could use the ex. Holley to mont. vitals, use the 02 sen. to tune with. Being NA would be pretty easy. Sometime off idle needs a bigger squirt to get the fuel down in there. Do what your comfy with, but since you have everything in place, I would prob try and make it work.
One bummer about the FI, if the ECU fails, another 1K+ to get it going, lol. My first LS was a blowthru carb, Procharger, MSD 6010, about as reliable as you could get. I am a little spoiled by the FI's abilities on some things, esp boost control, logging.

 

I will start by saying thanks to the replies on this thread. Second, I've been messing around with tuning efi since the mid 90s (accel DFI) and ls1 edit in the early 2000s so efi tuning isn't new to me. It's not a tuning problem im tired of dealing with but more of a lack of confidence i have in the holley terminator. The very first problem i ran into was a overly rich condition that a few "professional tuners" said it was my tune. When In fact it was #6 injector driver burned out.
Im sure the more expensive holley products like dominator is more reliable but im not trying to use one of those. Just thinking maybe in the future a carb might make driving the car more enjoyable.

 

Go Haltech and don't look back. Holley is china, never forget that. Also, you would think Holley has a massive amount of backend to help, not so. It's a probably less than 20 guys working in the company, at least from what i have heard. Haltech is made in USA and they have good tech support. Their equipment is near milspec. I am with you wanting a carb, but it's either OEM GM ecu, Haltech, or Carb. Not dealing with that Holley bullshit, even though they are the biggest in the market.

 

well i fixed the problem with the car. I believe when the POS corvette filter/regulator blew and i was running 75psi fuel pressure it caused a few of my injectors to lock up. As soon as I replaced the injectors car ran alot better.
I called holley last week and asked if i unplug the injectors on the terminator will everything else still run and they said all i need is a tps sensor on side of carb and I should be good to go. Still might go that route. They also said they never heard of a injector driver burning up in their units...yeah right there has been ALOT.

 

This board is full of people running Holley on builds that don't need anything an oem ecu won't do. I never understood why. Then again, the last Haltech I dealt with was a bit glitchy, but that was nearly 20 years ago. I have no idea what their new stuff is like. The Holley systems I dealt with from the mid '90s to early '00s were just garbage. All that left me with a disdain for most aftermarket systems in general, although occasionally they are needed.

 

Got the car running along with picking up a glass hood for the car. I took the car out on its maiden voyage for a 80 mile round trip. It did better than it ever has. So glad I made the jump to carburetor. Doubt im going to get any passes at the track this year since there is only about 6 weeks left of the season. Hood needs painted and adjusted along with some hood pins for safety( factory nova hood latches aren't reliable).