Not sure if they used centrifugal advance on the distributors then but if so you can take the cap off and see if you can move the rotor one way or the other. Witch ever way it moves will be advancing the spark so you need to adjust the dizzy the opposite direction.

 

Well I rotated the distributor clockwise about 1/8" on the outside diameter... and the sound is gone. Thanks everyone for helping out.

 

Hitting it with a timing light really wouldn't be a bad idea.

 

really no point. if it was a freshly built engine ya but if it is a old sloppy engine no point. run the timing till it pings then back it off a hair.

 

If there is a spec for it, I feel it is always worth while to at least attempt to set things to spec...... Makes troubleshooting any other issues much easier, when you can exclude something. And this one is an easy one to deal with too.... (provided he actually has a timing light.... )

 

considering someone already converted it from TBI to carb makes me lean toward the timing chain being stretch to the point where the computer couldn't compensate so it wouldn't run right.