It's a 2v (2 barrel carb came on it stock) Cleveland. It'll have somewhere around 8:1 compression if it's stock. They are essentially the same heads they put on 351M/400 engines. The 4v heads have much larger ports and come in closed or open chambers....the earlier version s gave nearly 11:1 compression with stock flat tops.
OK Cool. I just ran the vin again and it said. 1974 Ford Ranchero 500 GT 2dr Pickup 8-cyl. 400cid/170hp 2bbl
F351 2v I looked up those numbers and I think I read that it is a performance intake. I chose a 500CFM AVS2 P/N 350-1902. What do you think of that choice for this intake and motor?
The quickest way to tell between a 351c and a 351m/400 is look behind distributor left is a 351m/400 has the rise under intake in front Right 351c almost flat Between 351m and 400 changes are internal need to measure stroke.