I recently picked up an 89 rs with a bad engine it had tbi 350 ive swapped the engine to older 350 with carb this is my first time doing anything like this i would like to know if the in tank electric fuel pump is safe to use with a regulator to the mechanical pump that will be feeding fuel to the carb? If not please tell me a good setup if possible thanks to any help im advance

 

If you have a mechanical pump why not use that and simply disable the electric pump the fuel will flow right through the electric pump being pulled by the mechanical pump the other option would be to skip the mechanical pump and use a regulator to drop the electric pumps pressure down to 5-7psi that should work pretty good ive done that on a few projects and it worked great good luck

 

Why not just put the TBI on the "new" motor and send it?

 

My recommendation: Put a regulator on and be done with it.

If you use a mechanical pump with no "pusher" pump feeding it you're most likely going to run into vapor lock issues.

 

Why leave the carb on it and fight that whole conversion hassle? Why do ANY extra unnecessary work? Not saying that's necessarily the case; butt if you don't HAVE TO use the carb, but could just bolt on the existing TBI instead, why not?

 

Because the OP might not see it as a hassle.

 

I'm asking the OP, not you.

Let him make that call.

If he doesn't know what it takes to make that swap, it just might be.

 

I wonder what the OP's plan for ignition timing is?