Mopar action did an article 6-7 years ago with a 62 savoy. Stock 5.9 with tti headers and exhaust. Not sure of the gear. It was tuned by a Chrysler engineer. Ran low 13’s I believe. I’m gonna try to find the article
My experience with a stock 300hp Magnum says that this is pretty optimistic. Even basic 1/4 mile calculators would put a 3200lb car at 13.5/105mph trap speed. That Savoy must be a few hundred lbs more making "low 13s" on 300hp impossible unless it started from a 10mph roll.