Is the Distributor the original?
If so then due to old grease the advance shaft has been known to hang up and not allow the timing to drop back off smoothly upon a drop in rpm.
I would also consider choking the Carb off slowly at idle to check for vacuum leaks .
Also check that there is slack in your throttle linkage at idle and that when throttle is applied that the motor does not roll over far enough to pull the throttle open more.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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