Installing new means pulling the old door and track, checking the jambs for square, and setting new track, springs, and door to match whatever headroom the 1955-era garage actually has - not what a catalog assumes it has. On tighter clearance garages that's a low-headroom kit; on standard clearance it's a normal track set.
One limitation worth saying plainly: we don't keep every low-headroom kit or odd-width door on the truck, since the older stock in Newton Falls doesn't run one standard size. If your opening needs a special-order width or a low-headroom track, that adds a few days to the job before we can come back and set it. We'd rather tell you that up front than promise a same-week install we can't back up.