it’s exactly like buying a chinarello frame and putting a stickerkit on it, then equipping it with the finest passion. sure, it’s dishonest if you try and sell it as OG, but to ride around knowing what you got…no harm - no foul, you do what the budget allows.
el oh el
Early Steamrollers did come with 1" threaded steerers and non-Fatties Fit Fine curvy chain stays.
Check early FGG for reference.
So what you have may be legit.