50cc pumps supply enough fuel to feed a methanol or E85 Dominator. Why do you think any 4150 would need that much fuel for gas? Make the engine burn the fuel correctly and you don't need to add that much fuel. Sufficient timing, the correct heat range spark plug, the right fuel for the compression ratio, a quality ignition system... all these things make the engine you have burn the fuel best. We can add that more compression helps, better cam, better cylinder heads, but that adds a bit more money. Do the things you can to make the engine work better at burning the fuel.
It's hard to say without knowing your .050 cam info, if 288 is advertised then probably around 230. Converter should probably be a 10" and stall will need to be around 4000 RPM . And most likely it will also need to have the timing locked to perform best. What plugs are you running and what heads?