My project bike has a 124" s&s conversion using original hd case. The case has a crack on the bottom that has been epoxied and has slow leak. My question is, if I buy a used case, how much machine work will it need to use the 124 parts? I am aware of the need to bore to 4 1/8" but is there any other machine work that would be necessary for flywheel relief or such? Also this is a 1999 dyna and so far I haven't been able to pin down which cases of which models I could use. Any advice would be appreciated.