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It does look like a Mark 4 to me..tomorrow I am pulling the rad on it..I will try to get some #'s if possible..
If I could carry it up the hill I could buy it for $60 lol..
The early 454 are the same as the early mid 80s. They have a cast 4 barrel intake with the TBI adapter. I had 2 of these, and were great motors. Had a **** ton of torque. And simple lol, wish I had one now.
LOL 454, it is quite a distance to carry the engine! There was stories of back in the day when they had the same "all you can carry" but it was all you could fit on a hood. Someone supposedly got a powerlifter to pull a hood with a engine on it up the hill!
I pulled a valve cover and got a casting #, it appears to be similar to the 236 "peanut port" heads and I do believe this verifies it as a mark 4..