once the truck is hot drive ti up on ramps for better clearance and shut it off, then try to start the truck to make sure it wont start.
then assuming it didnt start take a pair of jumper cables and run the red line from the positive terminal on your battery to a screwdriver and touch the ***** driver to the starter (you will get sparks, dont worry they wont burn you), if it dosent turn over then something is causing your starter to sieze, most likeley heat, try something like this
http://eastwood.resultspage.com/search?p=K...20wrap&rk=8
you should be able to wrap some kind of heat insulation around the starter to keep it from getting as hot, actually painting it with chepo silver paint even helps a little.
also if the starter turns over just fine you could be having problems with the neutral safty switch somehow overheating and screwing up
EDIT
also about the intake try buying gasket paper and making your own gasket, its not that hard to do with a little patience and a razor knife , round holes can easily be made with some small copper plumbing parts used as punches. also try ultra copper if the black isnt handeling the heat, and you are letting the stuff cure without tightenign the bolts down, right?