Ok guys i have a b16 in my 90 integra. My mods are Aem cai, Dc 4-1 Header, Full 2.25 cat back. My question sould i spend the money on my head( ie. cams, valve train.) Or should i do a b20 bottom end with my stock b16 head. What would you guys do? And what should i be expecting to pay for either option. Thanks for the help.