[KobraKarl]

Dennis.

here are the # off of my car, It is a big block! ,the cut outs were done by the builder !

driver side 61/4 " louver bottom/cutout top

passenger side 5" louver bottom/cutout top

cutout starts 1" rearward of fender flare

I really think tou should fit up your headers ,do a little math ,a little measuring , start with a small hole and enlarge it a couple times as you go .

you have a small block and that could make my #'s off for what you need

good luck, take your time ,have fun

Karl