hi i have a 78 440 with 4532287 heads does any one know what they are and if they are any good . ccs valve size ,i have a set of rebuilt 516 heads with hardened seat and the small exhaust valve 1.6 which are better .i now have about 125 psi on clyinders ,i am running a edelbrock idle to 5500 cam with same intake holley 750 carb hipo exhaust ,does any one know what i have for hp now . and what i would have with 516 heads .one last question for know reading the chiltons manual it says 78 440s only had 190 hp? does that seem possible and is that at the engine or rear wheels