hi, got a problem with my 69 302, its got the 5/16 studs for the rocker arms, and i ran into a problem, engine was rebuilt not too long ago and i pulled it from the car i had it in to put it in my 66 mustang, while the engine was out, my dad decided he'd re-adjust the valves for me while i wasn't home.... he was told with the setup i have that you just bottom out the nuts... which is false... he tightened my rockers all the way down, and never told me, i was trying to find out why my engine wouldn't fire up for 2 weeks, cranking on it day after day.... now i find out what happened and i adjusted the valves properly, but its still not firing up, and the way its cranking, the engine seems too tight... any suggestions as to what could be wrong?