[Mike C]

All or nothing IMO. If you aren't going to make a real upgrade then just swap springs in the heads you have. The 882 a ubiquitous head that's not any more crack prone than anything else IME.

Get an compression tester with removeable hose that you can hook to your air compressor, an on block spring compressor and just swap springs on your existing head.

If you haven't bought springs already figure that's a part that comes with the new heads which makes that upgrade a little less expensive big picture.