The 250/292 engines are really good at doing what they were ment to do, haul all day trouble free! For the best info on hotrodding an inline Chevy L6, get Leo Santucci's book on them called Chevrolet Inline Six-Cylinder POWER MANUAL. I haven't seen an automotive engine that doesn't respond to improved breathing yet, but there might be one out there. I drove the modern Chevy L-6s so many miles that I just don't remember any more! There are amazing hotrod products in Argentina and Australia for the L-6s. Look around here, too! Chevy did all kinds of things in bigger trucks. Plus, the L-6s are so dependable because of all the main bearings. You can't beat one main per rod! Have fun!