305 chevy no start?

Hi, me and a friend change the camshaft, carb, intake manifold, timing chain and the lifters on a 77 305 engine. While changing these parts we made sure we had the timing correct. the dots on the timing were facing each other, the piston was up on #1 plug and distributor facing #1 plug and of course the spark plug wires were in the right order. The problem is the engine wont start. Also we found two broken pushrods after the we heard a sound and replaced them. We have gas, spark, replaced spark plugs. the engine does not respond when the distributor is moved while cranking the engine. Any thoughts are appreciated