inner fender question

[pkj]

i know this is bassackwards, but i am setting up the front clip on my 68 1/2 ton with no cab in place. the cab is not available right now and i want to work out as many of the new parts fit issues as i can (nothing else to do) right now. the question is, where do the back of the inner fenders sit height wise in relationship to the frame? looking at a friends truck damaged both sides i came up with about 1 3/4 inch up from bottom of frame. his was not consistant side to side and had damage on both fenders. tough question but some help would be great. thanks, pkj