Cam advice for more torque from 340

Well, I just got to the timing chain. I needed to get at least thus far because I am replacing the gasket.

Honestly, going any farther is daunting. Seems like I could really mess things up by removing the timing chain and gears.

Question, how would I advance the cam timing from here? Just move the teeth over a few?
I posted this on my other thread about the heads and pistons but here is TDC with my piston. It looks to protrude out the block by the amount of dome in the middle.
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