Quote: How would the carb effect 4 cylinders on one side if the intake splits the gas from each side of the carb to 2 cyls on each side of engine? Can you tell why this is driving me nuts?
( (1) good point (2) because the solution is(right now) out of reach & the symptoms are making no sense. But we WILL figure it out and if you have a tach I'd ground each wire & see exactly how much RPM it is or is not dropping on each cyl
Like I said either a carb issue or a vacuum leak or a combination of both. I would start by unhooking any aftermarket tachs ect, and then plug off all external vacuum supplied components to isolate the problem.
and if you have a tach I'd ground each wire & see exactly how much RPM it is or is not dropping on each cyl 
