My wife found this one at a garage sale over the weekend. What a great wife I have, as she endorses my Looney Boy habit! She was worried she'd found a pig in a poke, but I cleaned the dirt out of the dry for years fuel tank, mixed up some gas, and it lit in three pulls! Even the blade was sharp! I went right out and mowed the front yard with it. It's a 8237 with a 1978 serial number, but a D engine and suitcase shroud. The Toro lookup shows a Darth Vader head and F engine. Was this a 'transitional' model, or did someone just switch engines? I mean, it 'looks' original enough, and the drive system works great and all. Just wondering what I've got here.