TKX performance improvements?

I’m curious how much floor cutting is needed for that 5 speed in a 67-76 abody floor compared to a stock 4 speed. I want over drive but not the hydraulic clutch set up.

Sorry OP - I did not mean to steal the post. Back to you sir.
It’s really not a lot, there are multiple posts that show how much cutting is needed. If you choose to get the conversion kit, they give you the sheet metal and template in order to modify your tunnel.