Check out Mitsubishi Diamante 3.5's, Don't think they came in a DOHC but the block will be the same. Those cars go cheap and so do their engines, Also check for rolled sports, I found one a year ago for 500 and it only had 60k or something on it. Sports are SOHC as well but If the block is what you're after it's the same.

1999 Montero SAS'd on Kings and stuff

1998 Montero trying to get a V8 Swapped