Fuel Starvation?
Other than the load on the engine and the acceleration.
You should be able to duplicate the circumstances in the driveway.
- You need to measure your fuel flow at RPM
- Your fuel pressure at RPM
- Insure your dist can run to the max rpm, maybe even swap in a stock type ignition system.
A friend was chasing his tail with a holly sniper etc. at higher rpm the engine would run crappy and die, the ECU would loose its programing etc.
He found part of the problem was the coil wire would move during acceleration and got burnt on the manifold and short out.
He fixed that but still had ECU issues.
But it ran fine till the ECU would crap out.
He switched back to stock parts and things were more normal, he sent the ecu to Holly and they sent a repaired/ replaced ECU. He put it all back on and still had the issues.
My guess, ( no hands on time with the car) is electrical noise from the stock type 67 charging system.