440 Dip Stick length...

I just traded for an 83 Ram Charger, 2WD, with a 440/727 in it from a 1977 motorhome. The motor needs work and I plan to replace the intake/carb, clean and pretty up the motor. The dip stick was missing when I got it and I ordered on though Auto Zone. It's a Spectre piece, part number 5722.
I hope this Big Block forum can help me with what the correct length is for a 440 dip stick. The one I got just doesn't look long enough. The old tube is NOT bolted to anything and doesn't look like it belongs. When I mount the new one, where does it bolt to?