Should you desire to go to the Carter YF, as Mike mentioned, the correct YF(s) would be:

Automatic transmission (auto choke) - Carter 2101s
Standard transmission (manual choke) - Carter 2100s

A major issue with the YF can be the neoprene (diaphragm) accelerator pump.

If a daily driver, one has few issues.

For a "monthly" driver, failure of the diaphragm will occur as the neoprene tends to harden once it has been in fuel, then allowed to dry. Using ethanol-laced fuel makes the problem worse.

I would expect failure on a monthly driver maybe every 3 years, more often if ethanol is used.

Jon.

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