On a dyno or trial and error on a pulling track is the only way if thats whats going on. SM and 450 carburetors came with the same size venturi. Both can be tuned to your engine and if correct there's not much difference in my opinion. They do have some different mettering passages. IH didn't tune there engines for max. power. Max. power and a engine lasting for years of hard work are to different things. So if using higher octane fuel and just short runs power can be added by tunning.
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Today's Featured Article - A Farmall Story - by Ed Meadors. The year was 1978. Our young family had recently moved to rural Chesapeake, Virginia to a plot of land which would finally allow us to realize our dreams of a huge garden, critters and more lawn and pasture than we would ever use! We needed a TRACTOR; not a riding mower or tractor wannabe, but a real TRACTOR. The answer to our needs materialized in the form of a '44 Farmall A, complete with cultivators, discs, single plow, a 5ft.Woods belly mower and one, mounted spare 9.00x24 rear wheel.
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