I was thinking 3.73 as well. i had them in my old scrambler and they were fine. he will only use this on street. i dont think the amc 20 will hold up either, i wrecked 2 in my scrambler with a 305! one with 2.73 and the other with 3.54. i managed to blow em both..heavy on the mash pedal..ugh!

304/th400/ford 9"s front/back 7"lift 15x10/35's
it will run someday