No.
No it will not. Because it is a lock-up converter and the 350 turbo is not set up for a lock-up converter.
Everything I've heard, no they will not...
yes a 350 turbo converter will fit a 400 turbo and vice versa
Yes
No.
NO............
turbo 350 or 700r4 turbo 350 or 700r4
2 qts
not necessarily. depends on what it was made to do.
If you're talking about a TH400 transmission, yes... the TH350 torque converter is one inch smaller in diameter than the TH400 torque converter (12" vs 13"), and you'll have to make sure the holes on the flexplate line up (or drill them for both patterns). You'll get a bit more stall out of the 350 converter. If you're talking about the 700R4, the answer is going to be no.... that uses a lockup converter, which will not interchange with the TH converter.
A turbo 350 has only 3 gears. The 700R4 has 3 gears plus over drive and lock-up converter. And it is the same as a 400 turbo with overdrive.