First I never heard of green antifreeze causing any leak. The key there is using RTV sealant at all 4 corners of intake and possibly at entire front & rear edge of intake manifold.
Second, hard to say if engine is shot per-say. Did it smoke before this happened? Then if not, bottom end should be ok. You didn't mention milage.
If lifters are shot, you should replace cam too. Heads? Dunno.
OK, lets say the engine is bad. I was going to go this way but, decided to go the 10 grand way for my engine. I know I know this is a boat place, but they do - do car engines too for same price and roller cam/lifters are installed.
It's a long block, all stock, but for $1600 delivered to your door. Hard to beat if you can mustar up the extra 800 bucks and do it yourself.
http://www.rapidomarine.com/default....s/default.aspx
I'm not trying to sell anything here or promote a web site. Just trying to pass on a great deal that I was going to do. You could do short block too, but for the extra 150 bucks for heads included, it's not worth using your heads. IMHO
Wish you luck and remember, you do get 600 bucks from the Gov. soon too. hehe
right!