Quite a motor!!!!! I'm guessing it's running indy heads (which are different from SII heads) which require a special intake (use that one, and plug the pop-off valve provision)
3.7 bar!!
The ECM for those engines can still be found on ebay on rare occasions.
I doubt it's a 231 (3.8) as the seller thinks though. I'm pretty sure the indy motors were closer to 3.0, but can't remember that well. They were HEAVILLY destroked so that they could withstand the required 9,000 rpm for the entire race.