Some phrases just feel good as they roll off your tongue. Four bolt main---the WEAKEST sbc bottom end and four link suspension, just extra expense for 99% of street driven rides. The Mopars that dominated drag racing had a Single 7/8 all thread with a rubber snubber that loaded or unloaded the top of the pinion housing according to track condition. Left the rear end with pre set wind up and free to follow track irregularities. If street driven use rubber bushings or possibly urethane bushings in the link ends but NOT Heim ends.

Evan