Think you'll find that your 54 will be a 3.90. That should give you a little more top end. You're correct in going with the Fentons. Use the following site to calculate your engine rpm's as the diameter of your tires is a significant factor and your top gear ratio will be 1.00.
Http://csgnetwork.com/multirpmcalc.html
The chambered muffler will have a nice sound all the way up....the glass or steel packs will be extremely loud above 2300 rpms. Hope this helps.
Dave
