B18b1 is a great engine for begginers, but your engine does have some millage on it and i don't think it's going to be worth modifying even if the engine was taken cared of. if i were you, i'd save some cash for an Engine swap, preferbly the Gsr engine (B18C1 1.8L USDM DOHC VTEC 94+ Integra GS-R 170hp). getting the normal I/H/E on an ls doesn't do much.

oh and what's your budget?

sell ur b18b1 for $75!