I dont know if this is going to help you, but if memory serves correct, I think these pistons are made with a little more height in them so that people who do not deck the block arent so far in the hole.

Best advice...bore, then mock up a piston on each bank and measure depth. You will likely have a different depth on each side like I did. Then take the block to be decked and you should be close to zero, this being your goal...

Long story short, I am pretty sure the 408 piston will be in the hole LESS than the original 360 piston with the deck untouched.

It's kind of a pain to bore then have to deck afer measuring, but it will ensure you get it right. Or just bring eveything to your machinist and have him seal with it.

Hope this helps.

Maybe a builder with a lot more esperience than I has more specifics to offer...

P.S. I used a closed chamber head, 4 inch stroke and 6.123 length rod.
I think CH was 1.465...a 9.588 deck height.

Guess my block deck was 9.571 since I ended up .017 out. lol