Can someone measure and tell me the length of stock 360 A body oil dipstick and tube please

Sure. The stick and tube are factory original from a 79 360. 392 pan IIRC.
Great, looking forward to it. I just measured my actual stick which I hadn’t previously done, and it is 21 3/16” (close enough to 21.25")

I’m starting to get to the bottom of this. I’m beginning to think they may have either cut down the tube to lower the oil level to prevent windage (racer free horsepower thing) or have the wrong tube