As long as the flexplate is the same size or has additional mounting holes.
To add to this answer in depth. i changed from a 350 to a 454. the 454 had a th400 transmission and the 350 had a th350 transmission. (This was a 4x4 so we had to use the th350 transmission because it had a married transfer case)the th400 flywheel did NOT match the th350 torque converter. We installed the th400 converter and it fit perfect in the th350 transmission. I would make sure torque converter bolts to flywheel and as well fits into trasmission before attempting to install in vehicle. It is a huge pain to make the swap half way through the install.
A 350 or 400 torque converter will not work on a Powerglide transmission due to differences in design. All are somewhat similar but come in different sizes and connections.
Start in the middle, and work your way out, in a circular pattern. First, go half torque, then full, turning the crankshaft by hand after each cap.
Everything I've heard, no they will not...
if you do all the work yourself, around $350 in parts. mechanic shop labor will be another $1000
Answer The 86 Chevy block and the 87 Chevy block are the exact same block, nothing changed, it will fit perfectly.yes
yes a 350 turbo converter will fit a 400 turbo and vice versa
The trans will bolt directly to the 350,but you will need a new torque converter. I had a Nova with the same set-up because the guy who had it before me blew the original trans and replaced it with a 700r4 from a Camaro. The Nova now has a 350 with that trans, but like I said new torque converter. you dont have to buy a new torque converter just use the straight six fly wheel on your v8