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.

Four speeds are fun and when you're young you don't get tired of shifting.

But, Dartnut is right. Converting it and getting it all to work like it should so you can enjoy driving the car will be 10x more aggravating than anything you've been through. Sometimes you have to just be content with things about your car, and be happy.