I noticed in one of the other threads that are up on this car in the engine picture it appears your using a reproduction dipstick and have it painted Black. Based on what I know from back in the day and on my 72 400 car's the dipsticks are shaped differently than currently reproduced and were dipped in Orange paint to match the Air Cleaner.
You can reference this old auction of an NOS piece to see what I'm saying.
Hope this helps
Ron
http://www.ebay.com/itm/NOS-Mopar-1971-1973-Plymouth-Dodge-383-400-440-ENGINE-OIL-PAN-DIPSTICK-3577245-/301740744536?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2047675.l2557&nma=true&si=0byaz9oqUHvMX3LueJeGLVUE5K0%253D&orig_cvip=true&rt=nc
