If you're talking about the length of the driveshaft, the front yoke should go into the transmission all but 1 inch.
Yes you can, But the driveshaft won't be long enough.
According to Novak Adapters, the TH350 weighs 120 lbs.
the TH350 would mate up to it, it should have had that stock
turbo 350, TH350. but its a BOP TH350 not a chevy, same tranny, different mounting holes
TH350, unless you want an overdrive, then, I would go with the 700R4.
It will, although you might have to get the rear driveshaft shortened, as the 700R4 will be longer than the TH350 which was used in 1983.
Yes, assuming the TH350 has the Buick-Olds-Pontiac bolt pattern. A Chevy TH350 will also bolt up, but you will need an adapter from B&M or another supplier.
M38 (th350)
Yes it will, it is the same bolt pattern.
Any Chevy transmission will bolt to any Chevy motor. At least RWD. 1955 to current. A 454 should really have a 400 transmission but a 350 will work. Depending on what you are putting it in there may be an issue with the driveshaft length and the yoke that goes into the trans.
Automatics would include th350, th400, or the 700r4, if you want a overdrive.
YES 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.