He can convert yours, if he still does that
I shoot for 14.3 to 15.5 AFR at idle by restricting the idle fuel feeds on 4 corner carbs, that usually results in less than 300 RPM drop from idle to neutral warmed up.
My old pump gas 518 C.I. six pack motor with a solid roller cam with 260 @.050 on the intakes with a 108 LSA installed at 106 ILC would idle at 850 RPM in gear and at 1000 RPM in neutral with 14 degrees timing
It wasn't easy to get the carbs, all three of them, to do that but it was well worth figuring out how to do that