[Tom Vaught]

At my old job, the first one when I worked for the "F" Guys, our mechanics used to calibrate every stick with two lightly filed marks on the OPPOSITE side of the stick.
So any Non A/C stick will work if you put in 4 quarts plus 1 for the filter and run the engine for a couple of minutes. Then let the engine sit for a hour.

Come back and check the oil. The reading will now be 4 quarts in the pan and one in the filter with a full size filter. If you have a smaller than one quart filter it does not matter you still have 5 quarts total in the engine in the two places. File a mark on the back side of the stick for the "1 quart low" oil level.

Then add the last quart of oil, run the engine, let it sit again and after the same period of time take a second reading with 6 quarts added to the engine. Make a mark on the stick at the higher location.

So now you have a "calibrated" oil dip stick for your engine/oil pan/oil filter configuration.

If you have a 1967/1968 engine /oil pan some of those used a different marked dip stick as they wanted 6 quarts plus one for the filter. Doesn't matter though if you mark the back side of the stick. If the lines match then you are good. If the lines are different you know exactly the oil pan offset from the AVERAGE Pontiac OIL PAN configuration.

Kick-out pans, deep sump pans, makes no difference. Put your oil in the engine, run the engine and do what I posted above.

Tom V.