42RH in 68 Dart advice/request

hey chris, while we have you on the line... what's the HP/torque rating for a 42/44 vs the 46? since the 42/44 is 904 based, i assume all the parts & practices to beef one up in order to handle more power would be the same?

i guess what i'm asking is would it be worth it to build out the 42/44 over a 46 for a mild application to take advantage of the lower parasitic losses? or is that a bunch of nonsense and the cost to build one is the same as a 46 and the power loss is negligible?