Multiport is the best way to go, however a lot has to be designed into the system such as runner length and the design of the rest of the system, also it has to be matched with the cam correctly in order to take advantage of intake tuning. If it is improperly matched it will run poorly. Tbi is nice b/c it is simple and it is cheap. BTw I think that crossfire was a tbi system. The manifold runners were what overlapped butit ran like crap, my dad had it on his 84 vette.