I have since changed it to a Learjet 24B..
I'd think the differences between the numbers for the 23 & 24 would be negligible as (from an unchecked source):What's the cruise speed on the 24B?
I have since changed it to a Learjet 24B. Its basically a 23, but has some updates to the fuel management panel, the instrument panel is nicer (similar or nearly identical to the 25) and the enunciator panel is located on the top dash hood. So I am now working on the Learjet 24b or LJ24. (big windows version, not the multiple small windows).
Perhaps a modern "retrofit" panel and a 60's vintage original panel option. All the 24's I saw on Controller.com for sale had all been upgraded with Garmins and RVSM which requires a more advanced autopilot.