Sequential Multiport EFI

I'm also not convinced that two O2 sensors are very necessary. After all, most intake manifolds are NOT divorced side to side, but rather either 360 or 180. If you get the O2 right on whichever side, you can tell what's going on by comparing plug readings cylinder to cylinder

So far as a "complete" kit, you pretty much pays yer money and takes yer chances. One problem I have with some of the outfits is that they are (were) not all that programmable to much different engine setup changes. That's one thing the Holley HP/ Dominator takes care of, as you can set it up lots of different ways, and later, if you change the hardware setup, you just reprogram the thing.

But you sound like you want more of a turn key deal, and for that you have got to get the checkbook out.