I was just at an auto parts store buying some parts, and the guy running the place told me that the 400 was built for one reason....smog, i didnt really stick around to chat with him, but i dont really know what this means, i just recently put a 400 in my truck, with the help of a friend and i was expecting a little more power then my prior 350. i understand the basics of an engine, and i can say that i have some mechanical skill, im justa young guy and i would like some info from some of you more exp. older guys on this eng, maybe some mods that would improve its performance. some tuning tips, its in a 83 k10 4wd, i dont want a strip truck, but some thing with a little more pep. its got a accel dist, 450cfm edel and a torker2 intake, as for the other specs, i have no clue, i would guess it is all stock. the engine was out of a 80-81 plowtruck. any info on this engine would be very much appr. thanks

-Jesse