HELP!!!!

I have a 1978 king cobra that i put a boss 302 in the car was running before i put the new engine into it. I'm done with the swap now but the car wont start i have spark and fuel I'm using the 1-5-4 firing order I'm pretty sure the engine is out of a 69 boss is there a different firing order i should try or use i need help it my ride to school and its my last year of highschool I'm open to all suggestions

yes it trys to start but wont the bad to barrels of the carb are leaking i talked to my uncle (senior master tech ford) he said its staying flooded because of that and thats why it wont start.