I have a 86 TA and want to go to Carb 350 How much of a pain in the *ss will it be to have everything work I know it has a VSS I want that to still work with the trans It has a 140 MPH speedo I like.
Can I use the fuel pump in the tank or will I have to change it ?
I want to use MSD Ignition System.?
What about the fan Switch?
I also have 4 Wheel disk brakes will it affect that?

 

you can keep the stock fuel pump, but you need an AFPR (adjustable fuel pressure regulator) a carburator needs about 6 psi pressure, and your tpi pump is pumping about 40psi pressure, so an AFPR will allow you o adjust that 40psi down to about 6.

you can use the msd ignition system, they work the same for computer or non-computer controlled distributers

as for the fan switch...???
its pretty simple just do a search on the board to wire one up.

as for the 4 wheel disc brakes, that has absolutly nothing to do with the induction system, just make sure too hook up the vaccum line coming from the brake booster to a vaccum source on the carb, so your power brakes will work

a 350 is a direct swap for a 305, nothing changes. a carb swap isn't a big deal, here is a detailed guide on it

good luck

https://www.thirdgen.org/newdesign/tech/carbswap.shtml