I sympathize with you in your plight. I miss my 61 Bonni but…
So you said that the engine ran a couple of years ago, that combined with this statement forms a part of your possible answer. Go with the above suggestions and hand crank it a couple of turns to make sure it’s still loose, clean the carb, change the fluids out (gas lines is a wise decision and often overlooked item for beginning car enthusiasts) put in a fresh battery, maybe take a look at the belt(s) while you have it out, clean air filter, yanno, the typical annual tune up stuff, put her all back together and drive that baby!
Oh and also, just out of inquisitiveness, what’s the answer to the below question
say, it isn’t a 61 Bonneville is it? IS IT? if it IS you better treat that baby right MISTER!!!11!!