Blown headgasket. What's next?

1994redram said

So detonation is what I need to be looking out for when its back on the road? What ballpark timing should I be at?

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I'd back it back down about 5 degrees for now and just starting sneaking it up again. Any way you can afford an AFR gauge so you can see where you are at for fuel mixture? Sure takes the guessing out of things....

Are/were you running 93 octane fuel?

And I suggest having the heads checked for flatness while you are there..