His info is vague AND I am not an engine builder but my observations: Lets assume the OP engine is using the oem pistons. They will be really low on compression. Then that engine has a really large cam. (508 lift...235ish deg @.050??) If this is accurate this would make for a real slug of an engine. I cant imagine such an engine out running the 1972 340 magnum which was 8.5:1 and rated at 240hp. My 360 will have KB107 pistons, OEM LA heads and an Engle 230 degree cam. I will be happy with 350 crank hp.