Put it together how it is, bolt on some cdi switchbox electronics and let it rip. Nice motor. Will be faster than the 150 for sure. No need to modify anything, the cdi electronics will bolt right on. Block is the same except for 2 ground screw bosses under the starter which is really nice so you don't have to run your main grounds to the starter cap. Ive built a few stock ones with the cdi electrics and was happy with every one. Don't deck the block unless you are going to put gasket heads on it. Send the oring heads out to get cut if you want to boost the compression, its worth it.