Well, here are the measurements for Summit headers on a 68 charger. Fender lips are at 25.75" from the grd. Headers on both sides have 4 and 5/8 clearance from the ground. Also have new motor mounts if that makes a difference. Headers work with power steering and column shift plus a small mini starter fits on without pulling headers off. You must remove center link when installing the headers as the center link goes through the drivers side. I used Mr. Gasket Ultra seal gaskets for sealing. No leaks going on 1000 miles now. I sandblasted and painted with
Duplicolor high temp black paint and they are still perfect.

I can take some pics if you want.