I wouldn't trust any of the early S-10 stock transmissions behind a 350.
A turbo 350 will do the job, short tail shaft I believe, but measure the
length of the one coming out and match it up. Turbo 400 will work but you
will need the yoke from the turbo 400 donor, and then Napa has a u-joint
that will let you put the slip yoke on the stock drive shaft.
700R4 will do the job, most performance shops have a kit for the lock up
torque converter. This would be the route I would go.
Hooker has the best swap kit, motor mounts, wiring harness extensions, the
works. can be ordered with or with out the headers. If engine and tranny
are ready to go, swap can be done by two people in a home garage in a
Heavy duty 4.3 V-6 rad will cool it, get fan shroud from wrecking yard.
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