Yeah yrs ago the small journal crank everyone wanted for less fiction.We also put in a 283 small journal crank for a de-stroker.Spun those to the moon.But any how,given a consideration of a head swap,you don't want to get with a cast iron head and today's gas too high of a static compression ratio.SCR.That would be adding octane booster for the yrs you say you want to use it.The first link I am posting is for SCR and you can play with head cc's to see what that would be.

AutomotiveCalculators and Converters

The second link is dynamic compression ratio and that is considering the cam timing and how much compression is bled off because of that.

Wallace Racing - Automotive Calculators

You need to know to a certain degree given the bore size of the 327 that no matter what upgrade in a head you make the intake valve is shrouded by the bore size.