The vanguards are front runners also all the hp isn't necessary at all I made the mistake of buying a power plant kohler that is unbelievable fast and can't use the power on the track we run but it is a blast to ride but economically the vanguard or a George herrin built Tecumseh will give u all u need
And also u can talk to Cromwell c4 user on here he can tell u about the vanguard and the kohler and has good prices on parts great guy to get to know