I have a 60 year old bike that is eight speed (2 chainrings, 4 cogs in the back). The smallest gear on freewheel is worn out, visibly hooked. I've found a replacement freewheel.
I don't have experience with bikes this old, but I've been riding since the eighties. My experience has always been that chains wear out before freewheel sprockets, but I've checked my (original, I believe) chain at several points with my Park chain checker tool and it's below .75 everywhere. Do you think I can continue running this chain on my new freewheel? I would like to keep it as original as possible and finding a "period correct" chain would be very difficult.