Jury is in..... Holley Street Dominator vs. Factory Cast

When I was using a Street Dominator on my 340, I bent both fuel feed to carb inlet tubes. My recollection is that I always ran with a 1/2 inch phenolic spacer, but maybe for a little while it had the thicker Holley insulating/spacer gasket. These were about 1/8 thick and extended under the fuel bowls. If I can find a pic, I'll add it.