92 vette has AFR heads, cc503 cam, 1.6rrs, 32lb injectors and full bolt-ons. The oem piece is on there now. Doesn't seem to be running lean up top(so says the lm-1). Would it benefit me to move up to a Walbro 255? Or is the stock piece good enough for this setup? Thanks.

 

I would do it for the added safety. Get a racetronix kit and you should be good until quite a bit more power.

 

A good pump setup is cheap insurance for your motor.

C44 Fuel Pump Assembly

 

I would throw one in it . But even then it may not be enough if you wanted to spray it.

I am at 550 hp at the crank and I got a Walboro 255 thats right on the borderline according to my tuner Got to spend the money on a dedicated to spray when I do

 

Depends upon what you are going to do with the motor (Spray/FI). I have a 383 with very similar mods as you (more cam) and I have run the stock pump on this setup w/o any issues for 10 years. If your pressure is staying constant at 43.5 and your injector pulse width is not maxed out then you should be fine (otherwise might need bigger injectors). Just my opinion as it's up to you.

 

Everything seems to be fine with the fuel delivery. Good pressure and all that. I thought the stockers were only good to about 350chp. I'm pushing 389rwhp.

 

Nope/ don't think so as many guys are pushing 400 rwhp here on the stock pump with no issues. As long as you have continuous PSI even at WOT and your fuel trims look good you are fine.