2004r into a 73 Century help

[UNDERDOG350]

I have an 85 Monte SS 200 to put into my 73 Century. It came with no dipstick or tube. I bought a Pioneer 768023 but I don't trust the full mark is in the correct location. The reason I suspect this is this PN is also supposed to fit virtually all GM transmissions.
So my question is does anyone have an OE GM tube and stick they can tell me where the full mark is in relation to the tube?

Thanks Steve

 

[77 cruiser]

Full mark should be at top of pan or bottom of case.

 

[UNDERDOG350]

Nobody has a dipstick and tube on hand to get a measurement from?