I am assuming it ran at one time so the cam chain is not off unless it jumped. Have you done a compression check? Just wondering if you got a hung valve.
I would replace all the tune up parts and try again. Wires, cap, rotor, points, coil and plugs. modual of its coverted to hei.
Replace it all and turn the key either it will fire or you got another issue that needs to be tracked down. But with ignition out of the why its easy to find out what is left compression check and verify the plugs are actually firing. Then most of the problems are out of the way. A shot of either can rule out the carb in a few seconds.