Don't know a whole lot about increasing the ponies on em. I know that many cut the tuner down in the mid(you have to be careful with this one though as too short and it won't hardly run at all), add on the bubble back exhaust, shave the heads down some, and go with the 1 3/8" carbs. From about 77 or 78 on they will pretty well interchange most all of the parts in them. You can head over to screamandfly and spend a few days reading on crossflow mods. Some of them guys have built up some BEASTS out of the old cross-flows.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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