Olaf,
I don't think there is any need to get rid of the 428 crank. The only thing I would do is lower the compression and install a good streetable cam with reasonable lift to keep valve train stresses down and improve reliability. If the block checks out, it should last a good long while.
I have a question of George and others. My 428 has sleeves in three holes due to severe rust. The engine sat out in a field uncovered for several years. With roughly 2700 miles on it, I am still getting some
oil in those three cylinders (plugs foul up). Did I mess up my break-in or does it take longer for the rings to seat due to the harder sleeve material? All 5 other cylinders look clean.
Oil consumption is going down so maybe I am over the hump. I can't remember which rings were used. Are there some rings that are better in sleeved blocks than others?
Gary