If you were to buy that 408 stroker crate engine from Precision, nothing more than installing a stock 360...

 

I agree it could just have a blown plemum causing the plugs to foul. With the blown plenum your CAT could possibly be plugged as well. My truck had the "Death Flash " on it too causing it to have no power. but for the price of the crate engine that Hammer was showing it is probably worth the money instead of speading $$$$$$ for all the parts etc.... to get this truck runnig properly.