Thanks for your efforts, shonuff.
This 4M is actually 2563cc as indicated on the firewall plaque.
My work schedule has been keeping me from trying to call Weber during business hours and for some odd reason, email didn't occur to me right away. LoL!
I got my first response back from Weber, and they did not have a diffinitive answer without more specific info about the existing stock carb.
I will post our correspondence here, so it may benefit others in the future.
We should know but im not sure really.
The 4 M and 2F as in the landcruser would be my base thought but its
more than likely that the sedan carbs used during that time for the 8
and 18 RC motors is more likely the base carb for the Corona.
I had a Toyopet at one time and that one used the same carb as the 3 and
8 r motor.
So bottom line I would us the 38 DGAS manual or auto choke version that
will offer best function toque and economy with lots of Wow factor for
changing the personality of the little toyota.
It will function more like a new V6.
But to confirm the linkage and adapter options it would help me if you
could give me a tracing of the carb manifold base and or a sketch with
aprox bolt centers for the carb base bolt pattern and a referance to
direction of rotation on the carb linkage cable or rod function from
this I can confirm which carb is used in your application.
and last suggestion if you have a digital camera please take a few shots
of the engine and with carb ( less air filter ) so I can confirm linkage
We have adaters for every toyota application its just a matter of
confirming which your application is using.
If Im guessing it would be the K742-38 , K744-38 or K743-38 using the 38
these carbs use same base adapter and are for Toyotas of that Vintage
both 8,18 and landcruiser.
Redline Fuel Systems and Weber Carburetor conversions