Suggestions on flathead choice

[RGC1]

Thanks I appreciate the response that sounds like a good idea and no I don’t think I need to be bang on original but close would be good. I am hoping with it being in good shape or fresh I can travel 600 miles kind of thing over week end type deal . I did run across I think is about a 38 or 39 24 stud, not sure how interchangeable they are with the 34 trans , do,they bolt right up ? . But like you said going with 37,38 21 stud May be a better idea. Thanks