I took a look back at some the past year's auctions. I found a restored 318 Coronet 500 convertible that sold for $30,000. I also found another currently available at 36,000, this one an R/T clone. He may be a little out there at 36,000, but I kind of think I'll be alright at 20-25,000. You are correct I am figuring the $25,000 with the 440 conversion, though I wasn't too sure how much that would entail. K member? springs?