I would first open up the carb and look for crap in the fuel bowl.
If you find some then it’s time to take it fully apart, blow it out with very high pressure air re-assemble it with at least new gaskets.
Once all back together flip it upside down and with your mouth blow into the fuel in let.
You should hear no air getting into the fuel bowl.
If you do then something is holding the needle and seat apart and it will flood out on you if you where to get the motor to run.
If no air is heard then you should be set to bolt it on.
At this point just deal with the motor as if it was on a breakin/ engine stand.
If you have spark then you do not even need fuel just to hear if kick if you use some starting ether.
If it kicks then dribble about a Thimble full of gas down each open primary bbl.
Then motor should be able to run on that for 3 to 4 seconds.
You do not even need a working charging system if the battery has a full charge and you don’t even need the cooling system hooked up, nor even any coolant in the motor to run it for 15 seconds at a clip.
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I do stuff for reasons.
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