Speedmaster, Edelbrock LA, or magnum cylinder head MILLING LIMITS & common Milling Optimization

StreetSleeper said

am wanting 180 or more cylinder psi if possible.
If 10 to one is 147 psi at sea level, I am wondering how to achieve this.

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My stock 71 340 with what I believe is the stock cam and stock pistons and 2.02” valve J-heads was giving average readings of 175-180 psi when I pulled it down. Are you sur ed about that 147 number? Seems low compared to other results I’ve seen over the years.
Get the piston to the deck level and you should be getting close.