[63 & 64 Bowties]

I've sold a BUNCH of vehicles on eBay and I can tell you; forget the buy-it-now. I've only ever sold one car that way. You're right, the BIN just makes bidders guess on how much your reserve is.
Start your bidding low, and make your reserve the very lowest you'd be happy selling it for. As soon as the reserve is met it motivates bidders much more.
I thought the rat rod market had softened, but I've seen some lately bringing big-bucks. This 29 Nash in Idaho just ended last night with high bid of $26,000
You're selling at the right time of the year too. Springtime, weather's getting nice almost everywhere and the cars shows are starting up.
Good luck.