Im scared...i think i broke it

[MandarinSixSeven]

I just finished installing my new carb and manifold set-up, got it all done, ready to go and, now it wont start, and of course its sitting in my driveway and i dont know what to do...
when i first turned it over it almost started, for about two seconds, then it died and now there is no sign of life, just cranks over for a long time and does nothing...i dont have any frickin' diagnostic tools either...so fack, who knows eh?