Thanks. I did check the pushrod for the pump when I swapped camshafts last May. This issue has happened before and is worse with warmer weather when I take the throttle beyond a casual type drive.

I am now looking at revamping the fuel system with a bypass type regulator. This Holley unit is preset to 7 psi, right where I should be.


http://www.summitracing.com/parts/hly-12-803bp/overview/

I just checked the google search function here to see how others plumbed their setups. I am thinking of running the Carter pump with the next setup. Check out how Mallory shows the routing of their bypass regulator:



http://www.jegs.com/InstallationInstructions/600/650/650-4309.pdf

In 3A. I could simply attach the regulator behind the feed line to the secondary carburetor bowl and plumb the return line toward the firewall and down.
In 3B, I could totally reroute the output/pressure side of the fuel line and run everything back toward the firewall away from engine heat and obstacles.
My next question is this: Since I already plan to integrate a means to keep the fuel in a constant loop by way of the return line, would that be enough to reduce the fuel temps? I'm unsure of what temperature the fuel starts to boil but it seems that the return type setup should make some difference. I ask because the 3A method would be the easiest. I don't want to spend the time and then miss out on the benefits.