The engine should still start like normal. Normally I would say your initial timing is probably off, but most engines will start happily at 18.

What are you running for an ignition system? And what spark plugs? Are you running a really cold plug to combat the detonation?

I'm sure you were told last year, but your pinging problem is 10.5:1 compression with (what I assume is) no question.

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street