[glenview289]

Patrick,
My son and I did version C on our 289FIA EFI system. We thought it best because it kept everything behind the regulator at the designated pressure, we run 45 pounds of fuel pressure with 24 pound injectors, and like you, liked because it eliminated some of the lines around the engine to make for a cleaner install. We are very familiar with the diagrams posted as we bought our stack system from Wayne at Very Cool Parts. While we ran -6 hard lines from and returning to the tank, all flex lines from the end of the hard line, fuel rails (which were the equivalent diameter of -8 and treaded for same), and flex line to the regulator were -8. We felt that this larger diameter around the injectors may even act as some sort of a mini reservoir to draw against when a large demand (WOT) was called for. We have had no problems with this end of the system.

Bill