Lowered BBC, and Frame off-ers

[SanitysBane]

This truck project is going to drive me further over the edge of sanity...anyways I have a couple of questions, first off, I plan on dropping the front of my truck 3-4inches, well already from time to time when I hit a bump in the road the bottom of the collectors on my headers hit. I think I remember something about someone running a pair of car headers, like maybe from a chevelle? Does anyone know about this or can point me in the right direction?

Question 2-I am wanting to replace the leaf spring bushings, How do you do this? I got a propane tourch and a press, any pointers? And what about the A-arm bushings? Should I replace them now or just not worry about it?

Thanks for any help guys.