Checked out your link, you said it was in that black box with the picture of the alternator replacement? Is this the post you're refering to
http://www.67-72chevytrucks.com/vboa...1&postcount=58 If so part of your problem is your pump is way to far away from your fuel tank and is above it quite a bit. Like stated before most of these pumps are pushers, not pullers so they need to be as close to, and below the fuel level as possible. If you're dead set on electric, a Holley red is probably what you want. Is there any reason a mechanical set up like stock can't be used? I would personally use a quality mechanical set up and be done with it, especially if you're not running some crazy high HP combo. I have a built 427 SBC in my 94 camaro and I played hell getting the in tank pump working with feed and return (i used a new holley sniper pump that could be regulated down for carb pressures.) When that engine comes out and goes into the truck it's getting a good mechanical pump set up.