Building on what Speedracer said, if you are going to try to get the engine running then spring for the appropriate size engine mount or a test stand. By the time you cinch a vice down tight enough to hold onto a running engine you will have ruined the case. One thing glow motors have in common with electrics is that they require a certain amount of infrastructure. At a minimum you will need a fuel tank and fuel line that are glow fuel (methanol) compatible, a connector or glow starter for the glow plug. and some means of holding the throttle at whatever position you want it to stay. You will see people using fancy electric fuel pumps but after nearly 40 years in the hobby I still use veterinary syringes for anything smaller than a 12 ounce fuel tank. Watch a few youtube videos on test running engines and you will get an idea of what you need. You will need to make certain that your glow plug is good. It should glow a nice orange with 1.5 volts. Do Not use anything more than 1.5 volts, it will burn out in the blink of an eye. Seriously, an old stuck motor is not your best introduction into glow power but if you can get past the learning curve they are rewarding and a lot of fun.