1977 Chevy Camaro engine wont start

Engine Mechanical problem
1977 Chevy Camaro V8 Two Wheel Drive Manual

i just got done replacing camshaft in my 350 chevy small block. I put everything back together and now it wont start. The starter engages and the enine just sounds like its spinning. All of the belts are spinning like they should be and I took off one of the valve covers and the vavles are moving like they should be. Also there is spark. I dont know if I wired the spark plugs up wronf or compresion or what. Thanks for the help