why not the h22? in the oct. issue of honda tuning they state that the h22 is capable of holding up to 600-700 hp, while the b series motor can hold up to 1000, unless your planning to do nothing more than a all out drag races it shouldnt matter, but it is your call, im planning on pulling my h22a4 out of my turbo'd lude and swap it into somthing else, prolli a civic, but a del sol is on the possible list also.... jmo...