I have a set of 360 heads part number 3769974. Can anyone tell me what I have like are they closed or open chamber and would they be good to use on a mild street 360?
That's a J casting. 75-76. 1.88 and 1.6 valves. Open chamber, probably specs out at about 68-72 CCs. They are about as good as any of the small block heads. If you get the 2.02 intake valves put in them they will be as good as the 340 X head. It's a good pair of heads.