I have been offered one that has a hit and miss back story but all pushrods apart from number 3 cylinder are broke and the lifters are bust out on the side .unsure of camshaft state but everything else looks ok .is changing the cam bearings something you can do at home or is it machine shop job as that mite be the only thing that needs sorting .the bores you can hardly feel a ridge and check out in spec maybe just a hone and rings