Replacement battery

[OldFoggey]

I need to replace the battery in my Backdraft but I'm having a hard time determining what type I need. The Backdraft Racing battery I took out doesn't have much information on it to go by. On top it says Silver Calcium maintenance free battery. I have Googled all the numbers I see etched in the battery and have came up with nothing. I checked on-line at Backdraftparts.com and they don't even sell a replacement battery that I could find. There is a label on the side with the large number 619C, Then at the bottom of the label it says 12v 40AH. There is a number on the top of the battery that says toll free but it must be an overseas number. Normally batteries are labeled with a number that indicates the size so you can just pick up a replacement any where. Anybody had to replace their battery? If so what number did you buy and can a lead acid be used in place of the silver calcium? When I Googled silver acid batteries almost all answers where from Australia or New Zealand. Per most posts, Ford switched to those batteries in 1997 and the voltage required to keep them charged is 14.8 volts verses the normal 14.4. Not knowing if the 619C number is the cold cranking amps I'd hate to buy a battery that doesn't have enough power and destroy it. The engine is the 351W stroked to 392 Ford crate engine.