Jeff, it looks like a Meduim Riser from the pic. Those are correct carbs for a Medium Riser. I have never seen a single-engine 427 that was reverse rotation. That was done to turn the props opposite directions in twin-engine boats. If the wet manifolds have HM on them, it is most likely a side-oiler. The "cast but not drilled" blocks were in bigger boats and were lower horsepower applications. The Holman Moody stuff were usually sideoilers by the late 60's. They also put the MR top end on 428's for some V-drive applications. My dad's G hull Rayson Craft came from Gardena with a 428 that had that top end on it. If it is a 428 there will be no crossbolts or side galley. I would be interested in the marine equipment if the buyer isn't using this for a boat. I still play with some of that stuff. My email is
captcj@hughes.net.
Blair Patrick