Engines with lack bottom end power?

here's the 380hp crate

360 Crate Engine Buildup & Dyno - Mopar Muscle Magazine

here's a 5.9l built similar to 380hp crate

5.9L Magnum Engine - Make Mine A 5.9

here's the 300hp crate before and after a cam swap



here's a low cr la 360 stock 2bbl to a fairly warmed over