Why would tying the feed area of the carb regulator to the feed area of the NOS regulator be different from using the 4 ports on one reg? Would the sudden NOS fuel being turned on make the reg slow to respond if it was also supplying the carb WFO fuel?

My regs both feed from the side large hole. I can rig this with the pass through with the present locations of the regs. Still gonna be using one type of fuel for both systems, and the engine at 10-1 will use pump swill. I need to get a different fuel tank setup and may do a dual fuel deal.

Sheet I got for 22/26 jets has a 6* timing retard. 26/32 has more.