After mentioning to Brad (Brads70) that I wish I had a few more inches to get driver's seat back ... but wanted to keep OEM seats, not start drilling more holes, etc .... he found the following (hope its ok to link from other site):
http://board.moparts.org/ubbthreads/ubbthreads.php/ubb/showflat/Number/7671904/site_id/1#import Great tutorial - and Brad was gracious enough to fabricate the new brackets, and then paint them!
So this morning ... in about maybe 40 minutes ..... we removed seats, installed new brackets, re-installed seats ... and voila ... gained about 2 1/2 inches ... perfect for what i wanted.
The article linked mentioned that 70 model may have problem with seat belt mount preventing more than inch or so of travel back .... but didn't find that in our case.
We did it so quickly it gave Brad opportunity to advise me on how to fix drivers seat locking mechanism, find my MSD box, confirm engines intake and head type .... all before lunch ....
Great thanks to Brad for all help and hospitality .... and if this link isn't a dupe - hope it helps some others!