New 383 wont fire

Alright, I got off a little early today and decided to get a head start. I was happy to get the front end pulled off without having to remove the radiator/fluid. The crank sprocket was installed on the square slot, not the circle. I have everything lined up and feel confident no contact between the cam and piston was made. Small cam. Tomorrow I will get new gaskets and try to fire. No wonder I wasn't getting compression with the finger test!
I will post videos tomorrow.