I had the same problem caused by way to much fuel pressure. Most auto parts stores sell a universal regulator. You don't want to be above 3lbs. or so. I also added a small fuel gauge which are inexpensive and allow you to dial in the pressure.

It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed