I took some time out of my busy schedule (others can't) and removed some stuff that was in the way (spare, mat, liner) to take a couple of pictures.
The measurements I made were from a couple of fixed points on that inner fender well piece and the trunk floor.
From the trunk floor up to the center of both prop mounting hole: 3 inches.
From the gas tank sender wire hole center, forward to the front prop hole: 1 inch. The rear hole appears to be 1 1/2 inches to the rear of the front.
Any closer measurements would require a significant inducement in the form of JD No. 7.
Jim
Oh, the last was dinner on January 25, 2020, a "late" Christmas dinner with friends, before being cracked, dipped in garlic butter and roasted in the oven for 10 minutes. Recipe supplied on demand.