440 Piston Question

I bought an 89 D100 (I know it's not an A body, but this site has a member base so I came here) with a 440 in it. I was told that the engine was a stock engine out of a 71 Coronet. I have tore it down to the bare block and now know that at least part of that isn't true as it had 452 heads on it. The build date on the side of the block is January of 1971.

Before I put it back together I want to be sure I have the stock high compression pistons and not later low compression ones. The pistons look like the ones in the picture and come up to almost flush with the top of the block.

Any input on what compression these are would be much appreciated.

Look like standard pistons to me, nothing fancy. You need to bring each piston to top dead center and measure how far down the hole they are, micrometer or dial caliber works. But if I had to guess, those look identical to the ones out of my 440, you might, might see 8:1 or 9:1.