I swapped a 305 with a 350.
Now I'm having starting problems.
I got the car started, it runs and then when trying again, the batteries dead. It won't hold a charge.
I replaced the battery and had the same problem.
I then replaced the alternator, put in another new battery and it
starts and runs for awhile and then when I go to restart it, the battery is dead again.
I also noticed that when I go to start it, it will click a few times and then start up. The starter has a new solenoid on it.
So, I've replaced the battery twice, the alternator and a new starter solenoid.
Any ideas?

 

Sounds like a wiring problem, check your power and trigger wires to the starter, the alternator wiring, and all your grounds. I bet you forgot one of the grounds when you swapped the engine.

 

My guess is oine of the starter wires...Too bad you spent so much and you probably didnt need it!