OK. Checking because some '64-'65 cars had it at the rear of the oil galley, and they tended to light up the oil warning light under hard braking so the factory went back to the oil pump location and issued a TSB.
How many quarts of oil do you put in for an oil change? If less than 5, the dipstick still isn't right.
Just trying to eliminate the easy factors, because otherwise if you want to fix it the pan's going to have to come off for installation of some baffles.
As long as there's good oil pressure the rest of the time, and the pressure dropoff is brief and only under panic braking, you're probably best off not worrying about it. The money, time, and effort would be better spent on better brakes!
