there have been some people who put the h22 head on the h23 block but its not really a popular thing to do. it sounds shady to me. it can handle 30psi but he doesnt know the compression ratio? are the cams from a new core or are they regrinds? what all was port/polished? was it given a valve job? who did the port work? what size are the injectors? it sounds like hes trying to sell something he either doesnt know that much about or something he doesnt have. just my $.02