Compression ratio? Stock roller cam block? Valve size? Head type? The Comp XE 256 recommended above should give some decent bottom end, but if the CR is above 9.5 and it's a roller cam block, you could get something with more lift and still the short duration with good low end torque. Roller cam retrofits to the early Gen I blocks also work very well but those aren't cheap.
1955 CJ 3B, 381cid sbc (441cid all aluminum sbc coming soon), AGE M22W, Teralows, Warn OD, OBA, Premier Power welder, Warn 8274
1968 CJ 5, factory 225" w/ headers/450 cfm Holley, T86AA, Belleview winch, Warn OD
2012 Wrangler Rubicon Unlimited, Warn 9.5 xp-s winch