May have screwed up installing new cam. Need help!

If you've turned the engine over and don't know how many times, you need to start fresh. Stop with the 180 out, 360 out... back to basics with observable functions.

is it all together? If so, turn the engine over and WATCH the #1 intake rocker, second rocker from front on drivers bank. When it runs the open to close cycle, the timing mark coming to TDC, that is #1 firing.
No intake, same deal watching the #1 intake lifter. Up, then back down, next time mark comes to TDC, that is #1 firing.

This all assumes you are turning it over clockwise looking at the front of the engine.

Roll it back about 10-15* and set the timing to fire there, rotating the distributor to fire a timing light. Should be ok to start. Sometimes they want a bunch of timing to fire first time. Prefill carb and make sure squirters are working as well.