Spark plug gap

I am running Autoolite 65 plugs in my 360. W2 heads around 10 to 1 compression. Mopar 284/480 hydraulic cam. My question is it seems to pull real hard to 5600 rpm, then falls flat on its face. Doesn't seem to gradually just all at once. I pulled a couple of the plugs, and they were gapped at .025. Would this do it? Im running a msd digital 6al. What would the proper gap be? And is this the right plug for my combo. And before too many people tell me, I know the W2 heads are too much for the cam that is in it. It was just an experiment to see what the heads would do without changing anything else.