Chevy 350 motor problems

[Grimgearhead]

I have a 72 gmc with a 350 motor. I'm having some trouble getting it to start. I had it somewhat running. Then I deep cleaned my carborator and tied the vacuumed modulator in with the brake booster in the intake. After I did all these I haven't been able to get it started. It turns over and tries to start but won't. I know it's not the spark so I figured it was the carb. Before I go and by a rebuild kit I wanted to test it with a new carb off another truck but still couldn't get it started the new one was a automatic choke that I didn't properly wire in due to the fact I didn't have enough time to but I got it hooked to a power source but the same results. So should I still by the rebuild kit or could it be something else causing the problem I'm not really sure what to do anymore haha can someone please help. Thanks for reading
Posted via Mobile Device
Posted via Mobile Device