If you plan on using S-AFC and 450cc injectors, you are going to need a Vortech S-FMU to set your base idle fuel pressure. If you are going to build it and go for more than 10lbs, I would recommend purchasing a SymTech Labs MSnS V2 and a 1:1 FPR instead of the S-AFC and S-FMU. Along with some 660cc injectors, you would have a fully tunable system that would compliment your engine build quite nicely.

The problem with S-AFC is that you still have to use the FCD or Missing Link to "trick" our ecu into not seeing boost. The stock ECU will only give you WOT parameters to play with on S-AFC. So, when you do start hitting boost, you can't tune the fuel maps to compensate for boost.

Here's a post of mine from tuner's explaining the cost benefits, as well. Post #13