Engine/trans Change

Ok I have a 1986 Chevy S10 2.8L 4x4, 4 speed manual trans.(original everything), and I want to swap for a bigger/better engine (perferably from Jegs). And possibly a new trans (if possible i would like a 5/6 speed, if not i will just stick w/ a 4 speed). And how can I get the fuel sender unit changed? Thanks

P.S. where can i get an engine cleaned in the No. Va. area?