I tried using that Airtex electric pump but something wasn't right. I put it on a stock, tired 230 with a Weber 32/36 progressive carb and it would start up and run for a minute or two and then die because the fuel pressure went to zero. I mounted it vertically near the tank like the instructions showed...

I probably will go to an electric after getting my fresh 250 running. I just have a newer mechanical pump and I didn't want to have to trouble shoot the pump when I'm trying to break in my newly rebuild engine. I have an Airtex E84070N to try. It has a much higher free flow rate (which I know really doesn't matter)than the E8011 and a max pressure of 5 psi which should be good for the Holley and not need a regulator. We'll see.