I don't want to sound like a naysayer, but 600 hp probably wouldn't sell for me for that cost. It'd have to be screaming to take advantage of the port cross section and runner volume (I think, correct me if I am wrong which would drive me to more money in the block anyway) unless there is a modified small runner head. Even then though it's just for looks, a pro-port 445 would do 600 hp cheaper and the whole curve would be nicer.
Now, if we could to a real big stroke in the 390 block, maybe with 481 inches, it may start leaning that way, but it would drive costs up and probably still require an investment in the block
That being said Jay, if someone wants the experience of a cammer, I think it would be great. The 445 could be Phase 1 and allow a ticket to entry with a big shortblock build later