ditto what old said. it should actually lean out at high rpms, and possibly run out of air, IF you were trying to use all 45 ponies. if not using all 45 ponies, it will run fine.
I, in fact, have a 428 carb, which I believe is off a naa, on my 950 right now. i had to jimmy the fuel line with some brake line and custom bending.. but it fits... but is the small factor carb.. small mouth etc..
I mow with that tractor fine.. mind you i'm pulling a 5' mower and not using many ponies....
you could drill a jet out.. but still you have the small mouth issue...
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