Is this a cam problem?

The OP stated that the PO told him it was a Mopar unit,don't know if he would
think he had something to gain by lying about it,but true it may not be a purple
shaft.That being said,my personal experience playing around w/pushrod lengths
and shimming the slanty rocker shafts showed the worst poss. deviation from the
design ratio down would cost approx. .020" lift,leaving you w/a .460 lift cam at the
max for a .440" reading.That would eliminate the larger ones(276&284) right away,
and MAYBE include the 268 cam,which would still require a bump in stall speed.
One thing I mentioned in another thread to be aware of,the valve lash specs for
the 268 and up purple shafts are.028/.032" int/exh.,WAY looser than the usual of
.010/.020" for the stock and 244 purple unit. Having the lash stock on the larger
ones will definitely kill the low end for sure.According to mopars own bracket race
recommendations,the "342" 268 dur. cam is the first cam that req. the stall bump,
leaving the rest of the smaller cams suitable w/the stock unit.
Unless the OP has some kind of class eliminator cam w/stock vicinity lift numbers
and larger duration numbers, he should be able to use the lift check as a decent
ballpark idea as to what he is running,:coffee2: