find an FF code trans. Not really hard to find. They came in the early diesels and gasers as well. Hell I got three in my back yard lol.
They're geared alright, could use a little bit of a taller 5th but im happy with it.
Won't work in a MK2. Unless you want to weld aluminum bosses to the side of the trans for the rear mount bracket.
If you've just got an NA, I'd suggest sticking with a diesel geared trans (AOP, AGS, ACH, 4S, 7A,etc). Of those, only the 7A was originally fitted to a MK1, and will bolt right into a MK2. The FF, FO, FN transmission will bolt to the block, but there is that problem with the mount. There MAY be a few F-series transmissions that are late and will bolt in, but I doubt it.
Get a 7A! It's the best for an NA