Whats a 4 speed fell like

I have always been a 4 speed fan. I have owned and driven several a and b body cars over the years.
Go for it, but my word of to advice to you is make sure you get a COMPLETE set up for your car and don't fool around trying to mix and match parts. Install new bushings, clips, etc. in the linkage or you'll HATE it. Make sure the transmission is good inside.
Converting to a 4 speed can be VERY expensive and frustrating especially if you try to cut corners.