Yup, fuel pressure is rock solid. I used to have it mounted before the carb ( fuel pump to the fuel pressure regulator (FPR), then "Tee'd" off to the carb, with return), but found that I was having some percolation issues in the line between the FPR and carb that caused irregular fuel pressures. My engine bay gets VERY hot, and the problem was exagerated by the fact that the FPR was located so far away from the carb (inner fender, firewall mount is not nhra legal) so the line going from the FPR to the carb was over 3 feet long. Even though cool fuel was constantly flowing through the FPR the fuel inside the feed line was stagnate, which allowed it to get too hot. I tried several things to relieve the problem, including insulating the line, but nothing helped.
Earlier this year I stumbled on a thread on Yellowbullet about FPR locations that prompted me to research the idea more. Turns out that mounting the regulator after the carb has a few benefits over fender well mounting. The one benefit that caught my eye was that the carb would now get a cool fresh supply of fuel since all of the fuel sent by the pump is now sent straight through the fuel rail first, then to the FPR. It's just like an efi system. What this does is ensure that the float bowls are supplied with the freshest fuel possible, and that the bowls are filled first without having to pass through the FPR first, eliminating a possible restriction.
For me it was problem solved, no more issues. Glad too since I bracket race a lot and am always chasing consistency. Any more questions feel free to ask.
