Every Mopar OEM stock production V8,from 273 2 barrel to Street hemi and 440 6 pack, motors are no where close to having the engine specs like deck heights and combustion chamber volumes correct for the stated combustion ratio
Their from 1.0 all the way up to as close as .3 ratio from the blueprint specs, their always lower
Your good on using todays lowest price and lowest octane pump swill is my main message, don't waste our precious race gas or your money to use in that motor