i carbed my 350 as well from inj.
HEI distributor,
pulled all the wiring. and the ECM.
You have to have a computer for the newer 700r4's.
Older ones you don't have to.
You don't need the computer to shift the tranny on the older ones, you just need a lock out switch so it knows to lock the converter.
YOU MUST ADJUST THE TV CABLE PROPERLY when using it with a carbed motor.
read this:
http://www.tciauto.com/Products/Instructions/instructions/gm_tv_cable_adjust.htm
and TCI also sells the lock out box you need to lock up over drive.
All in all, it's easy.