You smart folks out there have helped me before, so I'm asking for more input. I'm rebuilding a 390 for my 67 S-code 4-speed FB, and would like to know if I should go with a v/a distributor, or use the non v/a one that I have (Motorcraft C7AF-12127-E)? I am using an aluminum intake with a C7OF-9510-A 4 bbl Holley, C6AE-J heads, standard bore, C6OZ-6250-B NOS cam (HYD), 3.00:1 rear. I realize that v/a helps on fuel economy at lower rpms, but I've also been told that so-called "performance" engines should not have v/a. I suppose my q here is at what point is an engine considered "performance" enough to go with the non vacuum advance setup? The NOS cam is original equipment for a 390 GT/428 CJ according to my info. Thanks in advance for your advice.