Hi Wade,
I walked into Polk County (Florida) Tax & Tags with a handwritten notarized "bill of Sale" from the previous owner and proof of insurance from my auto carrier. It listed my name as the purchaser, the door tag ID number, the selling price, date and the notarized signature of the seller. I was asked if there was a current tag or registration. My answer was "no" it hasn't been registered in years." That was it!! No other questions asked.....no other information offered. Paid my sales tax, registration fee and the price of an antique tag.
A week later I received my Florida Title with the ID tag# as my vin number. As stick pointed out...get a replacement tag from one of the vendors, stamp in the numbers and rivet it to the door post.
I was also expecting to have to jump through hoops to get it legal. No inspection, no waivers, no hassle. Don't you just love Florida???????? Hope this helps!
Dave