Not the sexiest modification, but something I learned while working in area 51.... Indexing plugs is probably old hat to many here, but if not, it may be something you want to try. "Indexing" simply means using shims-washers to position the gap of the plug to fire in a consistent and it's most efficient direction.... Mine are facing directly toward the intake. I dunno if it makes a difference, but it makes me feel better
indexing spark plugs
Edit: racers will index using the method above everyone else will just use shims-washers made for indexing.... available at any auto parts emporium

Edit: racers will index using the method above everyone else will just use shims-washers made for indexing.... available at any auto parts emporium