I would contact Wayne presley, at
Distributor of the Coolest Parts for the FFR Like everything else we buy, we're looking for more than just a box full of parts. We're looking for a company that will back up their products, and be there when we need them. Wayne has an excellent reputation for that.
Switching from carb to EFI - especially 8 stack - is not simply a matter of bolting on a new manifold. It's a very differant system. There's a learning curve, and it can be a bit steep. IMO, it's a much better system, and well worth the time and money to do it. Not only does it look better, but it performs much better. When we travel with the club, it's pretty obvious who has a carb, and who has EFI.
Like any EFI system, you can basicly divide it into two major components: The hardware, and the computer to control it. It's fairly easy to mix and match, as the computer doesn't really care where you bought the hardware, or what it looks like.
Do your home work on the computer systems currently available. There's a lot of variability on capabilities and prices. The best systems will be "self tuning" with a wide band sensor; I think that could be an excellent feature. But you can also get full ignition control with crank trigger and COP system- if that's what you're after.
The self tuning computers really aren't. You need to get the car on the dyno, and enter a basic tune that's pretty close. Then let the computer go from there. You'll get better results that way.
Some computers also offer full control of boost, transmission, fans, multiple injecters, etc. These are great features if you have a use for them. But don't pay the big bux if you're not going to use them. IMO, that would be like buying a turbo system, and then putting it on the shelf in the basement.
A common feature is data logging. You may not think you have a use for that. But I find it very helpfull to chase down a drivability problem, and to help get the tune right.
If you do go to a stack system, you might need to consider a new cam shaft. Individual Runner (IR) systems do better with a wider LSA, like 114-116*. You can use almost any camshaft you want. But you'll do better with a specific cam.
You also have to pay attention to your heads and valves. If your valves are bigger than the throttle bodies, you'll lose velocity and power - the engine will be a dog. IR systems are much more sensative to component selection than any other induction.