Install BBM w/headers

I ran in to the same issue years ago acquiring BBM pan gaskets. Along with intake, VC gaskets and a few others. I've gotten to when I order, I order extras.
I found a upper radiator hose at Advance, robbed the cap off my Belvedere and headed to town. Put about 40 trouble free miles on the new engine. Since I'm changing from mostly track car to a cruiser, I need to ditch the Detroit Locker. Clanging, clunking, and 4.10's on the street are very annoying. What's my best option?

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