Whats a 4 speed fell like

Stick shifts have zero or near zero slippage. They consume less horse power than an automatic.

For road driving, road racing, road touring, they rule and with good parts and a clean install and properly set up are double the enjoyment and way more efficient than a loose converter automatic (excluding efficiently set up lock up TC systems).

On the other hand, if your stick shift system is all jibbered up and a cobble of junky worn out poorly assembled parts it can be a cantankerous and massive pain in the butt to drive.
I have had this situation when I was young, and in that case, a near stock 904 with a manual valve body was way more enjoyable.