Headers are normally a guess, zoomies used to be on my motor before I bought it, it was faster but he didnt like them and neither do I, I put chrome dynatechs on it and then switched to perf welding headers.
I think the 8.90 nhra stuff you arent going to get away with zoomies they used to enforce the noise rule not so much anymroe but I dunno if zommies would fly.
upswepts they keep the car cleaner lol downs are out of the way and look better ...