A 429 short block sounds nice but I am sure you have all kinds of expencive stuff in it. I would have to lower the 12.5 to 1 so I could run pump gas. What would you want for the block only? Maybe a trade of sorts for blocks? The only thing is mine is only a 2bolt main, you would have to convert it over. I would love to come over and take a peek at what you have. Scott hit it on the head, I love that candy!!! LOL