Na, you don’t want to restore them. Too much wasted time, effort and money. Just run them the way they are. Better yet, if you have a bunch of parts under the work bench, put them all together to make a good running unique motor. I did and nobody else on the lake has anything like it!
On a more serious note, here’s a ’79 Johnson I did a few years ago. I had no access to the internet and wasn’t aware that decals could be bought online so I had to do the paint and graphics by hand after my dealer said the decals weren’t available so I had no choice. It’s a labor of love done with masking tape, spray bombs and a razor knife. I wish I had pics of my old ’75 seventy horse and matching six horse kicker done the same way but with three shades of color instead of two. The easy part was the gold pin striping which I bought at my auto supply.
Whether it’s a cosmetic or a full mechanical rebuild/restoration is entirely up to the owner. If you are tooled up and capable of it, why not? At the end of all your hard work, I can guarantee you will feel satisfaction.