What do you think a fair price is for my 1967 318 engine

I was thinking about $1500-$2500 for everything that sits on it

only if you consider the barracuda to "sit on it"

as far as used 318s go this is a very nice looking one and it has some nice valve covers and a matching aircleaner which bumps the price a little, but not much

I would imagine that most guys wouldn't spend more then 500 bucks on a 318 if they could get a 360 for the same amount of money