I have a TPI system with Haltec computer on the car that i'm building. My first plan was to use a Carb setup but now i will use the TPI. Can i replace the plate on my NOS cheater system with a TPI plate???. If.. anyone have one for sale?

I wouldnt, I think TPI and carburated setups use different jetting and selenoids.

If you are looking for an economic solution, check the parts numbers of TPI NOS kit and carburated one, keep the mutual numbers, selenoids etc. swap to suitable ones.

As I read on hot rod magazine previously mixing the kits is prone to use wrong part and damage of course.