I'm with Scratchn on this. Unless you drive your Newport every day I can't see the benefits to the TBI. If you are set on doing it, get yourself the TBI setup off a mid-90s 305 chevy engine like from a truck. Use the 747 ECM. The MOPAR setup is relatively unknown compared to the chevy system.

Changing the factory 2-bbl to a Holley 600 on my '64Dog 318 gave me a whole different feeling engine. Plus it's tunable, you can go to the parts store and buy jets.

That roller 318 is light years ahead of your older 318 and it'd be a much better starting point. Heads have better combustion chambers and the factory roller cam can be reground by Bullet Cams to something that will run great while still having really good driveability. Member Patrick on this board is sort of the leader on this.

R.