stroker blues

im back at it ..i hope that you guys out there can give me some good advice...ok..i have a 70 duster 340 with a 451 stroker....it ran great on the break in stand and for a few rides up and down the road then got worse untill it wouldnt run hardly at all...upon pulling the valve covers and intake i found a bunt push rod and the lifter was out of the bore and jusy laying there..bad lifter?..easy fix with new lifters and a push rod?no visable damage to the cam...motor has hours on it and maybe 20 miles on it...old school with ground 440 crank..509 mopar cam..Too much cam?..full port and polish 906 heads...also with a 3.55 sure grip...what touqe converter?...i have a frank lupo 9 1/2 street strip ..dont think thats right...all the tranny did was run hot .also at some point the oil pressure dropped way down to like 6psi..im hoping that gas thinned out the oil while i was trying to figure out why gas was coming out of the exhaust..this is my first time so go gental......thanks guys .any more info you may need ill do my best...a "friend" built this for me but he has trouble returning my calls