ORIGINAL: freakingfast
If you realy want an OPS you can get an 67 or 80 right now but you will need to swap around the back plate and crank housing, purchase the prop drive adaptor, non marine head and exhaust adaptor. All for about $ 400 US. You can even get the tuned pipe there too.
I love OPS engines, but I'd more likely drop the coin on a Jett 90LX for the product support.