its probably the alignment.
i cant get any shop to do a real alignment on any of my old mopars, they are all too lazy to adjust the caster /camber so they just get it close and send it,,
if i complain then its " its an old car it wont ever be perfect"
:bootysha::bootysha:
i agree, i dont think the weight of the suspension makes any difference, my dart has all of the original slant six stuff up front and a big block and it doesnt pull the wheels, pulling the wheels with a big block is more an issue of traction imho..