Runs great, but stalls out under power

[Catfish]

My A4 starts right up, idles great, accelerates good, but after running under power for 30 to 120 seconds starts sputtering and dies. It'll start right back up, but repeats the stall after a minute or two when under power.

The prop is clear and turns freely by hand, I installed an ignition tune up kit (points, condenser, etc.), I've verified compression in all cylinders, verified firing order, bypassed the oil switch, bypassed my fuel tank and am using a portable fuel tank (checked that it was vented) with new fuel, even pulled a plug wire while running to see if the engine performance improved (it did not). The fuel pump is clicking and pumping fuel....I'm at wits end. Anyone have any suggestions?