Engine Won't Start

[CRCRFT78]

I can't seem to figure out what the problem is so I thought I'd see what some of you think. Its a 78 Malibu with an LT1. Fuel gets all the way to the fuel regulator but won't go passed that point. I replaced it with a new fuel regulator and still no fuel into the fuel rails. There is pressure up to the regulator but not enough it seems to go any further. I don't hear any difference in the fuel pump (which may not mean much) but myself and 2 buddies are stumped. Anyone experience this or have any suggestions?