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.
![](/ubbthreads/images/graemlins/Twocents.gif)
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