As I've contended many times in the past, with a little cash and the willingness to do it right, old iron like the Lincoln 430 and 431 can be rebuilt many times and perform "as new".
We featured one such rebuild from my buddy in Germany, but here is a beautiful rebuilt in show condition inside and out. If you think the rebuild is too much to pay for, you can buy this one complete with all marine hardware and transmission for $7500. Therefore, if you already have one needing attention, the cost would naturally be far less than this to freshen one or a pair of them up. The Lincolns, by the way, are heavy iron, and able to be bored out with less concern than the thin-wall 427s.
More photos and data in the next post...............
Paul