Well heres a couple of suggestions I like the Rollfast....
If you get to the jackshaft part of it you may what the least expensive on the market it is likely the easiest to install from the looks. I'd change my decision on the bike and parts some at this point..
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Rollfast Antique with Tank and Carrier Old Bicycle eBay.jpg
The frame I have is a 26" GT triple triangle, if I'm reading it right. It is the Outpost model, kinda low-end, but it fits me well. It's rather difficult to find a frame that fits when one is 6' 4" and 195 lbs. Has anyone here used or seen this frame as a MB? Any and all input is welcome, as my 'play money' is limited.