I believe there were some performance-oriented 534's used in the marine field. Do some looking there, and you may find something. Also, forced induction can overcome quite a few cylinder head deficiencies...

Personally, I'd build up a 390. Plenty of power, less weight than a 460, and it wont cost you 1/10th of what I think this 534 build is going to cost you. Plus, how many FE's do you see any more? FE's just exude cool, and I'd go that way.

But if you do this 534 build, and do it right, it will be almost the ultimate in cool.