If I found a good LT1 or new one... (If they still make them) how much (ROUND ABOUT) would it cost to just rip the old one out and put the new one back in? Since everything should bolt into place and everything else should be identical...

I ask this because I am wondering if I should look to purchase a new LT1 motor to start things off fresh. Or should I purchase a Crate ZZ4, LS1, LS6, or LS2 motor and drop that in... or whatever.