dont worry man im new to all this aswell i own an ae82 sedan but its not the twincam version, if i was you i wouldnt go a 20valve if ur wanting to do it up because for the same price as a 20 valve u can get a 4agze witch will flog the 20 valve excpect for top end speed where the 20 valve is betta but off the line 4agze will easily win, also if u want to do a 20 valve up it would cost u a dam lot to make it perform the way a 4agze does. hope i helped a little cya