Well the best reply I can stumble thru is this:
1969 Z28 302 SPECS
Z28 crank 1178
Z28 dome pistons
Z28 cam grind
Near Z28 Head specs 64cc, intake and carb.
How do you replicate a 69 Z28 302?
Best I recall, GM had a pretty solid engineering prowess
when they threw all that crap together...lol.