I had of these beasts , it put out 148 horsepower without the juice. Purplehazeracing.com is a great parts source also Fastbygast.com . To put the big carbs on you'll have to have the backs of the cylinders welded up , get a set of snowmobile mikuni-style intake boots, so you know how much needs to be welded , then you have the backs of the cylinders machined flat, drill , tap and install .intake studs, mark the opening and start grinding the hole open. I ran 38mm mikunis on mine , also not all the carbs will run the same jets it took me 2 pistons til I figured that out. Also the Fastbygast over-shift mod on the shifter shaft is real nice , second gear is extremely hard to come by , the only new ones ouit there run around 500 bucks.CBX