Valve to piston clearance

As mentioned, your cam timing's outta whack.

The Toyota engines I race now have 20 thou shims to stack on the block when the factory turbo'd them.
Bigger turbo, more shims.

Back in the day, we tagged 4 - 5 welds on a sacrificial valve, sharpen, then use a piece of fuel line and clamp to limit the valve depth, and use an e!ectric drill to machine deeper valve reliefs.

Good luck.