The big issue with twins will be weight, V-20's are notorious for sitting low in the back with much weight on the transom.
How about twin 90 Yamaha 2 strokes? They are rather light.
I would chose a Johnson/Suzuki 4 stroke myself.......
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.