EFi come in two basic "types"
Batch fire = squirts fuel to more than one cylinder at a time, in a 'batch'. = TBI
Sequential Fire = squirts fuel to only the cylinder being fired.
Obviously the SFire is more desirable way to go but does cost more up front to perchase. TPI is prolly the cost effective way to get it. Then there is the rout I took and buy aftermarket MPFI = Multi-Point Fuel Injection = SFire, EDelbrock and Holley are the main players..there are others too.
