What you have (engine + frame w/"matching" numbers) is the bare minimum needed to have an original (restored) bike that will satisfy most purist-collectors. If you have the skillset, time & patience, you should be able to at least break even, if not realize a modest profit. To realize a substantial profit without cutting corners you'd have to be really well & longterm established in these bikes, already. Even then, it'd come down to cutting corners plus less-savvy buyers as the combo needed to earn more than "McWages"...unless you factor-in time. These bikes aren't getting any newer, more plentiful, or cheaper to restore properly. 5-10 years from now, they could be bringing a LOT more than they are circa 2018.