273 valvetrain question

Now yer talken!!! ya wont regret the higher compression piston's at all! it make s a HUGE difference with our small displacement little 273's! you will more than likely have a 91 octane at best motor now. but it will run good! What pistons were in there to begin with? unless you have a loose converter (2500 & up) or 3.91 & up out back id keep the duration @ .050 limited to 220.