I'm using a Napa Legend Premium 84, 850 CCA battery in my 470 Regal. Engine has 10.5 to 1 compression. Be sure you use at least single 0 diameter battery cables and you won't have any trouble starting up even after the engine warms up. Combination works great for me. 470 cu.in., 570 hp and 579 lbs ft torque. Roger On The Eight Day God Created Buick