That is honestly way to much head for 306 unless you are going to turn 10k and have a stick or giant converter. I personally spun 8k on ported iron heads with a 5400 Munsinger converter. ( I'm getting old) that weren't near that big. Car was on the cover of car craft in 2001.
Remember that port volume might make Dyno (computer) hp but will likely be a dog on the track. Port velocity will make a bigger difference since you are low end limited. honestly in a 302, I recommend to run no more then AFR 205 and have a cam in the 255 plus duration @.050 range. Lift is all about what fits and flows. With a roller cam and good range under the curve stay around 575-600 lift. Split duration also works well to help with exhaust scavenging and please dear God make sure you have great headers and NO flow restrictions. ( personally Lost 2 tenths putting race flowmasters on the same package).