56 will be way Rich for your altitude. You may see of someone nearby has or you can purchase a wideband 02 sensor and have an 02 bung welded into the exhaust. I use an AEM thats dash mounted in my WJ Stroker l but tuned my wagons 360 with my LM2 dual wideband data logger. My motorcrap carb was stupid Rich at 500 above sea level in Austin TX. Someone had a single action power valve in it in place of the dual stage unit, this created a.constant enrichment. I rebuilt back to stock and still had to open the altitude compensator to get the mix near 14.2 @ cruise. This and ignition upgrade got me up from 5mpg to 13hwy 11avg. Still sux but at least double digits. Without multi point injection you really cant criuse a carb at 14.7 -.15.3:1 as some cylinders will end up too lean due to crappy mixture distribution. same for tbi, so its possible with full efi and computer controlled timing to get 1-3 more mpg from injection. My motorcraft still has an off idle stumble no matter what I have tried I think it just has some crap still in the transfer slots or in the main body that an over night soak in chemtool could not even touch. I have a pile of new top end parts waiting to go on valves,springs, perf rpm air gap and Holley HP 750. Large crane cam .540 lift 302 adv duration. Going to port heads and such but want to refresh the bottom end, swap pistons, and install a mild stall.converter
06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
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90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!