I get it but blow-by still does not automatically mean new rings on a Packard engine, especially one with relatively low mileage. Unless a ring is actually broken and/or a cylinder is badly scored, stuck intake valves will do the same thing on one of these as the valve chamber is open to the crankcase through its oil return drain holes.
While you have the head off, use a bright light to visually check for cracks in the block between the cylinders and the exhaust values. I rebuilt a several that needed a couple cylinders sleeved and valve seat replaced even though they were otherwise in good condition. They are often hard to see visually but it won't hurt to look while apart.
Since it's been surfaced, check also that there is still valve clearance which will require come clay and time. There are full instructions on other threads,
one of which is here for a prewar engine but the same for postwar straight eights too.
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