Rejetted the carb tonight. I even recarbed it first. The original was a 350 CFM. The car had a lean bumble at really light loads. Put a 500 CFM progressive on it. Much less bumble and idled better, the old 350 carb was used as is and never fiddled with except to adjust idle mixture screws. The 500 when opened up had #55 jet in primary and 73 in secondary. Rejetted the PRI to a #60. Bumble is nearly gone. Will rejet with 64 and try again. When running the 350, it must have been on the power valve for more fuel. I noticed tonight the add on cruise would work at the same speeds, where it would not work before. The 350 must have had to have the throttle open farther to satisfy the fuel need and opened the power valve. Less vacuum to operate cruise.
Going to also change the PV in the 500, from a 8.5 to a 6.5. Looking at the metering block, it is only drilled to allow fuel from PV to the secondary. Not the primary. The 500 idles better and has more low end tq. Maybe just a better , used carb.
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