another set of small valve heads which may be good for the street cars but with valve relocation you don't have the luxuary of a "bolt-on" upgraded head without changing pistons or modify pistons if possible, and for the performance increase they claim its not different than the P-51's. to build a complete new motor around these heads i'm not sure that it will be any different than what is already available, performance wise. i would bet that dollar for dollar a good set of TFS streets would flow just as good with less work and you don't have to change pistons or buy different valve train. but on the other side of the coin another set of heads for the BBF is great addition and gives every builder an option he did not have before.
70' Maverick , 557 A-Head 8.90's...1969 #MATCHING MACH1 428 CJ RESTORED 1 of 1....1970 HEMI CHALLANGER