The F-504 and 606 appear to me to be the same tractor with different engines and misc like wheels. The 606 uses the 236 cubic inch six cylinder. There is alot of empty space between the F-504 engine and the radiator.
That 236 engine will swap with the six cylinder 263, 282, 301 engines. May have to change the front gear cover and/or water pump depending on which tractor or combine the replacement engine comes out of. Combine engine may not be drilled for clutch pilot shaft. Probably have to use 504 flywheel which may need to be re-drilled for the six cylinder crankshaft.
Seeing as no one else on this forum has offered advice on this subject, call Mike Bunck at Steel Wheel Ranch and get his opinion on what can be done.
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