Tuning with jets, Power valves and an O2 guage

I'm building a stroker.got it from Hughes Engines. They said that even with aluminum heads, the gas in the northwest is so bad that they recommended 10.0 not 10.5 compression. Have Az. Cell #. When they saw my shipping address they told me lots people were having issues running pump gas. That said, usually a bigger can helps lower cylinder pressure...