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The Speedway C4 for flathead conversion will only fit '49 and up. What makes the '48 different that this kit won't work on it? Does anybody make a C4 conversion for the '48?
You can see the same info in more detail here: The Flat-o-Matic
I'd be inclined to go with Flat-O-Matic, I have heard very good things about their kits.