Commando specs were 256 degrees duration intake and exhaust, and .420 inch lift on intake and .430 inch lift on exhaust. Taken from T.U.T. #35, "Mopar Stock Eliminator Packges" in the Direct Connection Performance Book. The stock cars with 4 speed cars were quick. They usually came with 3.23's in the rear. I've run up to 284 duration mechanicals in the 273 but the best was the stock 340 cam on the street. Soooo I'd recommend something around 256 to 270 duration. Don't forget a double roller timing chain. Does the HEI distributer fit in an early A? They are severely RPM limited in stock form, about 4,500 without mods, if I remember correctly. I have friends who own Chevys. I always ran the Mopar Performance kit.
