Back when I did run common cornohol fuel I had all sorts of fuel delivery problems. When I put the 73 dual plane 2brl intake and carb on my 67 273, I placed the fuel filter vertically by the timing cover just as it was on the 73 318. That along with the thickest available carb base gasket cured my percolation problem. Today there is plenty of ethanol free "real gas" available locally so I run that.
