We have a winner! Actually, we've had a winner for quite a while, but I've been unable to say anything about it for the last few hours. This car is a 1954 Fiat 8V coupe! pauln, you have triumphed! Send me your shipping address (murilee at jalopnik dot com) and I'll get that Visible Rotary kit out to you ASAP.
You're all wrong so far. Here's a hint: It's not a Ford product.
And I'm not trying to keep the Visible Rotary kit, because I bought two of them! One for me, one for the winner!