Admittedly I did hear some noise - I thought it was the old headers finally starting to leak. Turns out it was piston slap that went away after oil pressure built up. I took it on the highway after the car show and was driving rather conservatively when the piston separated from the connecting...
Took the car to a show on Sunday and blew the engine on the way home. After I got over being depressed about it I went shopping online (isn't that what we all do nowadays?) and settled on a new Blueprint 383.