looking for any kind of advice....im looking at a b-303, with either a cobra upper/lower or an explorer upper/lower and then now looking for a good pair of heads to go with this combo??? i really cant decide and really dont want to mismatch anything so any seggestions would help.....as of now its an 89 gt 5-speed vert with full exauhst, 3.73's, fenderwell CAI, ac delete, and under drive pulleys....id really love to be mid 13's or faster....