Another winterize thread

Got this 84 and need to winterize it, maybe without starting the engine.
When i picked it up we had trouble getting it to idle, vacuum gauge swung up and down.

The pvc hose was laying on the intake manifold behind the carb and the port was capped.
I thought that was the issue.
When cleaning the boat oit i seen the other port on the intake manifold and realized it had a huge vacuum leak when we were running it.

Who knows how old the gas is but i pulled out 15 gallons so far and the truck is burning it, or   how clogged the carb etc.
The alternator isn't throwing a charge and not knowing wether that could throw off the engine running or not but it revved up strong so i bought it for the donor motor in the waterlogged 96.

The top port was plugged. I pulled the plug and hooked the vacuum gauge to it.
The bottom port was wide open, and we never noticed it.

All 8 plugs look the same, no oil, water, rust, same color and burn to the same place on the electrodes.
So may or may not run to winterize, and don't know if i want to fool with it right now.

What i need is the best way to winterize it with 50/50 without running it.
It's going into storage in northeast ohio until next summer.
Thanks

Thanks keno,
Ill go over the link and take pics of what/how i do it so if theres a mistake it will hopefully get caught and remedied so i don't lose an engine.