Dave, I think what you have to do is place the studs or bolts for that mannor in the heads and hold them up, with like a spring clip, slide them into place, and then tighten them down with the head in place..... I know the studs need to be "broken in" with a series of tighen/loosen steps... which would SUCK in the truck.....
I know a couple of peple have done this on the older engines, which have firewall clearance issues also, not near as bad as we do..... but I think it can be done.....