I have very little knowledge about converters, my thought is that it wouldn't last very long due to the "dirty" exhaust. Rich fuel mixtures and oil in the exhaust would probably kill the catalyst. If you try it, I would think the bigger the better, less restriction and more surface area.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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