Treats has a 50cc Hi hi comp puch head (puch and tomos are interchangeable). I'm running it right now. Some people say it doesn't help a 50cc and I cant say for sure because I installed it with other parts, but I like to think it helped the acceleration and for 30 bucks it's worth a shot. A hi comp head will help your acceleration and mid range but doesn't do much for top speed but it does allow you to gear higher. A 27 front sprocket is easy and doesnt require modding. A Pipe will help. A sha 15 will be nice but a carb is only as big as it's intake. Always match or have a slightly larger intake. You can bore the stock intake to 15mm. You could probably top out in the high 30's to low 40's with all that.
I can't promise anything, This is just from personal experience and hours of searching lol (edited)