Auto to manual conversion. If you could do it over....regrets, pitfalls, long term opinions???

Not exactly what you want but I went from a 833 to a TKO. If your floor pan is for an auto then I'd skip the 833 and go to a TKO or T56, install will be way easier. I cut the hump out and am in the process of patching the floor now. I would have considered the Passon but I didn't want to die of old age before I got one. My TKO kit was from Hurst, customer service was great, ordered what i needed as I had a flywheel, clutch, etc.