My engine rocks and shakes the whole car!! Need Suggestions!!

Over the years alot of the replacement parts have been consolidated and your car may at some point ended up with a pass. car (big car) converter that would be pretty tight. Like 1600-1800 stall tight. With that cam you will get some rocking at idle in gear. Hopefully your new conv. is in the 2400-3000 stall range. Might not be the whole problem, but it would sure help. imo.