I replaced the Thermoquad on my 74 Jensen Interceptor (replacement 77 Newporter 440 engine) with a Street Demon 750. I am getting lean surge at freeway speeds, around town is fine. When climbing a hill on the freeway I can get out of the surge by mashing the throttle for a little while. I have 14 inches of vac at idle, about what it ever had. Should I swap distributors from the 5 degree intial advance stocker to a Mopar Perf I bought 20 years ago and up the advance to 10 degrees plus before starting on the Street Demon calibration?