You can get the heads on & off a studded motor in the truck, but you'll need to get a little creative...jacking up one side of the motor to pull that head, then the other side to pull the other head. The AC/heater box side is a bigger PITA than the brake side. Personally, I don't do any motor work in the truck..I got tired of fighting with that crap years ago, and I've pretty much got everything held togather with zippers, so I can R&R it pretty quick :wink:
If you have big valve springs, you'll need 12 point nuts to clear 'em. Also, load up the studs with teflon paste when you thread 'em into the block, and add a few GM cooling tablets to the radiator (or they may seep a little coolant).
My big question is "why are you popping head gaskets?". If the block and heads are straight, that shouldn't happen...even with NOS. Even when I've detonated the hell out of a built motor, I've always pounded the rod bearings before the head gaskets let loose. I'd only recommend original SyTy gaskets or Mr. Gasket #5724 Solicores, and torque 'em in the standard sequence to 70 ft. lbs.