I had an engine swap done. The guy couldnt get the TH350 to fit so he installed the 700R back in and charged me for the 350. The carb is an older carb. Is it true I need a switch for the TCC. Is this something I can get at pep boys or is this a specialty switch.

 

It is best for the longevity of the tranny (and fuel economy) to wire up the lockup.

Aftermarket kits are available through a few different MFG's or just search 'lockup' or 'tcc' here and you cand find different ways to wire it up yourself.