[marcalan]

The loud pop could be a backfire?

1) did you drain the battery?

If not, check the ground at the starter as well as the positive post. You can remove it and most auto part stores will check for free.

To confirm electrical issue
2) check spark by removing the #1 plug, make sure you are at TDC. Turn the ign key tothe on position. Place the plug with wire on the manifold to ground it out and slowly rotate the distributor to confirm spark and at tdc.

3) fuel, looking down the barrels, confirm that fuel squirts out of accelerator pumps. I did have a carb with an idle circuit that was too lean and the motor would start and stop, so make sure your idle circuit is adjusted.