We have about 15 good videos of the rear tire from the last 4 weekends.There is ZERO tire spin. I thought converter as well. So it was swapped about 20 passes ago. The trans was gutted then also. saw nothing. The 1st converter is at the shop . Getting opened up this week. Its had the issue with both converters. It's lame right at the hit. 2 pretty knowledgeable guys say they can hear it sound flat directly after the throttle is floored. The play back tach thinks that there is a peak around 3400 rpm. The tach has always done this since I've been running the car. The other thing is it will idle at 1500 with the carb speed screws backed out all the way (throttle plates closed). I'm assuming vacuum leak. Checked the carbs, carb adapter plates, and manifold lid. I'll pull the lower intake this week. It puzzles me if it is an intake leak, why it doesn't consistently run poorly? it has no adjustment for the converter pressure.
Doug