Weber 38 DGMS

Anybody have any experience with the Weber 38 DGMS. Got it installed but it has a gas return line that I thought was a vent line. Have gas coming out of the return line and I don't think it should be. Idles good and about 19 on the vacuum gauge. Has a "cough" on accelerating and doesn't run right cruising down the highway. I've tried calling Redline but we just play recorder tag and there email doesn't work. Just order a fuel pressure gauge because I've read that Weber carbs should only have 2.5 to 3lbs of pressure. No instructions came with the carb and very little info on the web.

On my '73 SR