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Well your buddy is going to have to figure what gasket (I'd use a .018-.020 steel shim) and what chamber size is needed to see if and or how much needs to be milled for the 11:1 compression he wants.
If he wants to throw a couple hundred bucks into the heads I feel it's worth it for the 516's. If the valve job looks good then maybe he might want to do a little more work to them. Pushrod pinch, more bowl work.
If un decided about the cam go with the 484. It's always good to be on the conservative side and have a more responsive motor.



Can a open chamber head be cut down to around 78 CC ? or will it be scrap by getting there.

Thanks
Dan.