Quote:

from what i understand the 200 you only have to mod the bolt in part of the cross member. the 518 you have to cut the hell out of the upper ( welded to the floor) part of the cross member. the 200 would be a lot easier swap then the 518 in my opinion.



Again, it depends on the vehicle. The OP was asking about a 72 charger. A 518 will fit in an e-body or 71+ b-body without having to chop the torsion bar crossmember.

One other thing to consider, last time I checked, the JW ultra bell to bolt a 518 to a BB was around $250 cheaper than that wilcap adapter, not to mention probably having to buy a special aftermarket flex plate to run the chevy torq converter. I know they also make an ultra bell to mate a BB to a chevy th350/400 trans but not sure if that would also work on a 200-4r or 700r4