[Mr70]

Passenger-Chevelle-Camaro-Nova,all the Big Block motors used it from I believe middle of 1969,through 1971 model production.
396/350Hp & 375Hp-402/300Hp-330Hp-350Hp & 375Hp
454/345Hp-360Hp-365Hp-390Hp-450Hp.
Look for the casting date off to the side,angled downward to the far left of the GM 4.
Something like H 5 9-for August 5th,1969,or B 11 70,for February 11th,1970.