Tee off at the bowl inlet and run a small copper line back to the firewall, then up past the hood lip to the cowl. Mount a mechanical 0-15 psi fuel pressure gauge on the cowl so you can see it through the windshield while you're driving. This carb doesn't need any more than about 5 psi of fuel pressure and I'm bettin' that the pump is puttin' out more than that, which causes the fuel pressure to overpower the needle and seat in the bowl and blow raw fuel into the intake manifold. Use tie wraps, duct tape or whatever you have to use to mount the gauge to the cowl. It's only temporary until you get the pressure under control.
And by the way, the Carter "Muscle Car" pumps will do a great job if you want to use a mechanical, engine-driven pump. Electric pumps will need some type of pressure control valving in the line.