he got back to me, he said he flowed the heads, he said intake gave 212cfm at .600 lift and exh 175cfm at .600. if he does a nice port job i should get very respectable power if im not mistaken. This is going to be a street engine in a 73 mustang backed by a T-5, ignoring the issues with the possible t5 failure, if he does a nice port job am i going to run into driveablity issues? Thanks