I got a mid 96 explorer gt-40 intake. I cleaned out the lower, but I need to finish cleaning the upper. The upper powder coated paint is almost brand new. I know I'll need a 37/64 drill bit and 3/8 NPT thread for the ACT sensor. It already has the boss for it and for the coolant return. What size do I need to make the hole for the coolant return line? Also, will the results be enjoyable going from stock intake to the explorer intake?