What could cause this? 360 problems ####update####

Dan the man said

I've installed many a cam and timing chain and never degreed them. Lined up the dots and no problem. I'm not saying that it shouldn't be done it's I never had any problems with the valve's hitting the pistons and we installed performance cams the same way

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I don't give a **** if you've installed 2746.5 cams and timing gears. There has been cases of them being mis-marked, and there's even been cases of cams being ground wrong. WE HAD ONE MEMBER ON HERE who could not get a new engine started and YUP!!! It turned out that somehow he had gotten ahold of a reverse ground marine cam