[custom1970]

Thanks for both responses.
First we have a Holley dbl pump carb, not a TBI. Yes, when you turn key to on, (not start), the pump goes for a sec or two. Also, we did not hook back up the old oil switch (it was leaking), the wiring diagram shows exactly what Determined and Mr. Rich are saying. That the fuel pump does need oil pressure to run. The carb/engine is definitely running out of fuel. The longer you cycle the key, the longer it'll run, but it will still run out of gas pretty quickly.

If there's gas in the carb, she'll run. Going to install the factory oil switch and hopefully that'll solve the problem. Unfortunately, have to take it to the parts store and match it up, as the one they say it should have is not the one that was on the engine.

Also hoping the fuel pump relay and hot fuel module are on the firewall or dash. I do still have the old engine, just not sure what they look like if they're still on it.

Thanks,