The 3782461”Camel Humps” were probably the best OEM production cast-iron head made by GM from 1961-70. They’re 57.5cc chambers so you’d be looking at 10:1 or better compression ratio (unless you go to a dished piston). Intake runner volume is 170-180cc. Used on 302/327/350 engines and most have 1.94/1.50 valves. They’re fifty years old so you’d want to buy from a reputable source and definitely not “sight-unseen” from a private party. A lot of them on e-bay. – here’s a rebuilt set from a machine shop with hardened seats and Z-28 springs for $800 plus 100 bucks to ship.

SBC Double Hump Camel Heads 461 1966 Corvette Chevelle | eBay

Good Luck,
Glenn