Hate to hear it for you buddy. It's nerve-wracking enough after all the work we do, then to hit the key and have multiple problems sucks. My suggestions:
1. Temporarily hook up a cheap electric fuel pump to your fuel system and fix the leaks. If possible use a known good running carburetor.
2. Test your electrical system off line like Dell recommends in Jada''s post from above. At the very least use electrical parts and distributor from a known good running car.
These are systems I would not trust or just hope work on a new engine first fire. Regroup and make damn sure everything is right.
Good luck, man. Keep digging you'll get through it.