Twins on a V20

[Steplift 72']

A neighbor had a 75 model with a pair of 85 Yamaha's and it ran well. An old fishing buddy had a 74 model with a pair of 70 Evinrudes and it topped out at less than 35 mph, wouldn't come close to planing on one. My old 72' model was rated for twin 115's but never saw one with over 200 hp. The old Yamaha 3 cylinder two strokes would be a good choice for twins, light and fairly fast.