Have you considered a 2.9 Vortec 4 out of a colorado - they came with manual and automatics. Make 185 HP/190 #tq. EFI from the factory.
I have the 5 cylinder version in my colorado daily driver - on the highway it gets darn close to 30 mpg. And its 100% stock.
I checked it out via google and found that the 2.9 has ever feature I DON'T want. Alum block, alum head, balance shafts, chain drive overhead cams, etc.
