Re: 60 MPH...achieveable? Who cares?!? Let blueprint an engine!
It is getting kind of old now. If it goes fast, good job. It goes fast. You'll get a 'atta boy and have something to talk about and maybe win some bets. If it runs smoother, good job. It runs smoother. If it does both, great job. It's still a boat load of mods and money to a $100 engine. Kind of like making a Honda Civic out run a Corvette, it can be done. Is it worth it? Depends on who is asking the question. The people on the outside will probably say "no" and the ones with their hands on it are all into it. It's relative.
Caution! I give opinions as if they were worth something. Use at your own risk.