distributer cap mods?

If you believe it's the intake leaking: Take a straight edge to your intake manifold & heads at the gasket surfaces & check for straightness by trying to insert a feeler gauge between the flat surface(where the gasket seals) & the straight edge. And by straight edge I mean a precision ground straight edge, not just a metal ruler or piece of scrap. If you can't get one at least take the intake manifold to a machine shop & they'll check it for you. Anything more than .002"-.003" & you have problems & need resurfacing. Measure accross the surface in the middle, accross the top & bottom, up & down the short edges & between each port & diagonally across the entire gasket machined surface. A pattern kinda like an asterisk. Never clean the surfaces of an aluminum manifold with a 3m scotch-lok cookie wheel or equivalent on a die grinder or dremel. It'll take too much material off & may cause leaks. Always scrape it off by hand.