360 LA engine crank no start

Compression, fuel and spark.

1..Compression. Are you sure the cam is in correctly? Have you checked compression? And if you have cranked it "a lot" you may not have enough oil on the rings to gain compression

2..Fuel. Fresh fuel. Make SURE it is fresh fuel, squirt a little in the carb throat. Have you checked the plugs? Wet or dry?

3...Spark. Good spark and at the right TIME. "Rig" a test gap, crank it using the key and "rig" this with a solid core coil wire. You should get a nice hot blue spark at least 3/8" long. You can briefely crank it and check timing "on the starter" with a light.