'68 Barracuda Formula S Fastback Restoration Background

340S Fastback,
I was considering the conversion to a Tremec trans for a long time but couldn't justify the floor pan mods and trans crossmember cutting on a car that essentially had no damage or rust in that area. So some recommended a GearVender, but I need to see exactly how that installs before considering that option. But having an overdrive is tempting. I have the old fashion OD. Swapping gears in the 8 3/4. I have 3:55 stock and a set of 2:94's with SureGrip for highway. Not ideal, but it works.
Took me 5 plus years of analysis paralysis to finally arrive at T56 Magnum decision. There are so many choices for overdrive swaps, pros/cons etc. You can always circle back at a later time and do an overdrive. My biggest issue was full floor replacement rust caused by water leaks early in cars life. Trans swap tunnel mods minor compared to full floor replacement.....