Re: 352 Vibration
Not engine related but I once had vibration around 60 mph. Its gone now but I don't know if it was cured by an adjustable panhard bar, directional front tires on backwards, two new tires or all wheel balanced, because I did them at the same time. I secretly think it was replacing the old tires with new, particularly since they were slightly different sizes.
To every man upon this earth
Death cometh soon or late.
Putts drives a 1965 Galaxie. Rebuilt 390, 4100 on a Performer, MX, AC, PS, PB w Scarebird front discs on Cragar 17" S/S.