I have a '73 Charger with a BB stroker and headers so I went through the same thing. I used a Milodan flexible dipstick (made out of stainless steel braided line material). IIRC, I bent the 90 degree bracket it had on it flat and attached another one I made out of aluminum (to extend it)and took it to a valve cover bolt.

I am sure there is probably a better way to do this but this worked for me.