The rear seam of the front portion of carpet should end right at the front face of the seat brackets. (just covering the bolt tops)
So in order of installation:
1. Install rear portion of carpet. 2. Install seats and seat frame bolts. (bolts go through carpet) 3. Install front portion of carpet, and rear edge is supposed to butt up to the front face of the seat brackets. (no holes in front portion of carpet).
I will add that after using three different fgf carpet suppliers, all made the front piece of carpet too long, thus messing up this fit. Some of them can be pulled forward a bit, but most I had to bite the bullet and put holes and brackets over the top of both pieces of carpet. But this is not the way the factory did it. An inch rear of the front bolts sounds about right. The carpet edge should just drape over the bolts and sit like that.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold