Jax326

Trying to keep the turbo 400 where it is without moving the crossmember or worrying about driveshaft length. With so many options (standard, 1"setback etc.) I feel like its a crap shoot and im just guessing as to what ones to order. Im also keeping the pass. side low mount ac and i've seen the bracket clearanced for the motor mounts. Any advice would be greatly appreciated.

72ls1

iTrader: (1)

I just dropped in a lq4 into my 72 yesterday. used the Holley plates with the stock location and it was super easy. Left the tranny in and it bolted right up with no issues.

Jax326

That's good the hear. Thanks for the info

bczee

iTrader: (12)

If your trying to keep the trans in the stock location, You will have to move the engine back to meet up with the bell housing flange. The 1" setback are the ones that will get you just about there. The Gen III/IV is shorten 1" by GM Engineering.
If you look at the back of the Gen III/IV and the Gen I/II engine. you will see that the back of the Gen I/II has a larger flange on the block where it bolts up to the Trans. And then compare the Gen III/IV engine you will see that GM shorten that flange about 1" to be able to fit the engine in to more compact engine bays.

You can try also the Dirty Dingo plates that are adjustable adn slide back and fort so you can locate the engine where you need it to be.

If try to keept he OEM AC, Many have moved the engine forward to clear the X-Members, but I would suggest you research the 2nd gen F-body threads as I have not done one.

I take the step or look into moving the Frame Stands if needed, that why you can use any adapter plates.

BC

Jax326

BC - thanks for the input. Im just not a fan of the sliders, I like something with a solid mounting point but I have considered moving the frame stands if need be. I know nothing custom is a drop in I'm just looking to get close, and if I have to break out the persuadin' hammer I will!

72 - what motor mounts are you using? I have the BBC clamshells now looks like id have to invest in small block mounts

72ls1

iTrader: (1)

I used the stock big block mounts. In the stock location. I was actually surprised at how easy and drama free it bolted up.

Can't help you with ac placement though because the only thing I'm running is an alternator.

2nd Gen Fl 'bird

iTrader: (13)

The only way the sliders would move after placing the motor where you want is if the bolts were not tightened. It is as solid as any other type plate. Also, the sliders come with the provisions to bolt directly to the clam shells so there is no need to source block mounts. Considering the things you are wanting to keep for your install, these may be the best route to place everything with out to much head ache. Just an opinion. Let us know how it goes.