getting my truck started

[cranky84]

i finally started to work on my truck. i knew the lifters has to be adjusted so i took of the valve covers. saw that i need some push rods, one of them didnt have one, and the other one was bent and fell through. so i took off the dis cap and the intake manifold and put some new ones, put back on the intake and the dis cap. lined everything up and now it wont start? it turns over but doesnt fire. all the plug wires are in the right spot. what am i doing wrong? the motor is a 454 that is out of a 74-75 suburban.