I had the same question and saw that wayne-o replied that he used 1/4". I was thinking 3/16" might do. There's a lot of depth in the cradle web plus they usually have a 90 degree flange to resist twisting. In searching the internet I came across a listing for a Hurst style mount from Vern Tardel that mentioned his were cut from 1/8" steel. It didn't mention if it would clear a mechanical pump so I sent a question to ask if it would and also to double check the thickness of the metal. Haven't received a reply yet since I just sent it today. Lynn
From Speedway Motors, Part # 91602046, (new) fuel pump can be disassembled to index the inlet/outlet area. Plus the rated output PSI is 6. Edelbrock carbs need 6 PSI, while Holley carbs need 7 PSI. I have seen this fuel pump to work correctly with either of these 4 barrel carbs, thus without the need to install a fuel pressure regulator. I am also using a Hurst front mount.