92 tbi 350 rebuild or repower ?

[Kudzupatch]

Originally Posted by rickpilgrim

I have a good 98 vortec 5.7......but do I really need a re flashed ecm and everything else for a box stock vortec 350 to run with tbi?

Yes. Vortec will has much better flowing heads, some of the best stock Chevy heads and a different cam. Your existing TBI is tuned to match a very different engine.

You have to remember that the computers are tuned very specifically to the needs of the motor that is in the car. Change anything that changes air flow or fuel flow and it changes the requirements of timing and fuel. Going to Vortec heads is not a small adjustment, it is major improvement.