A lot of the engine components are set up to work in unison. Meaning the crankshaft, piston and sleeve and carb. may not generate any improvements when installed by themselves in another engine. Are you up for a $112.00 gamble?
You may be able to tap the engine power earlier using a centax clutch (or just and adjustable clutch) and different gearing in combination with one of the exhaust pipes you have.