trying to tell which heads I have with out taking them off of engine/block is a ecz6015a which could be a 292 or 312 /heads are ecz-c they could be off of a 272 8.0 cr 173 hp /or 292  8.4 cr 202hp/or 312 9.0 cr 225 hp/ is there any way of telling what I got with out tearing it down? don't know what main rear main cap is/when I  got the car it had the A intake with teapot carb which makes me think that it a 292