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check the timing then

i have seen them so far advanced it souded like it had a choppy cam in it

way over advanced will shake and ping under med load

if its a mag engine and your mixing the la stuff with it it could be off on the balance

maybe its a premag bottom end and you have added magnum balance stuff

but then again i dodnt see how the other engine did this also

very interesting in deed

It idles nice and smooth, and timing is set pretty middle of the road right now.It doesn't misfire, hesitate, or ping.It just vibrates when on the gas at around 35mph and a little worse around 45mph, but smoothes when you speed up or slow down.No LA parts where mixed with this motor.It is a Mopar Performance 360, with all new parts and complete.I just added viscous fan, carb, headers, and fuel pump. I did remove all the belts for just a minute to see if it was one of the accessories, but it still vibrated.Removing the poly trans mount helped alot, but still some harmonic vibration.Thx.

Facts are stubborn things.