Fuse block advice

Hello all ,I rarely post being alot of info I need can be found here as well as being not so great on computers/phones . Thanks for all the input .
But I have a 1976 dodge dart buzzin' half dozen. I'm interested in updating the fuse relay block with one that has a few more circuits so I can add alarms and stereo and things like that .
The issue I'm having is I'm not exactly sure how to go about doing this. I've tried the search tab but I don't think I'm entering the correct keywords. Any help is greatly appreciated .
Is it as simple as getting a new box and just running wires ?
TIA.