The little 318 & Racer Brown's quality products

I have a 5.2 Magnum shortblock I have been thinking about building to replace a Slant Six in a 72 Demon.
A general consensus is to build a 5.9 or go big and stroke it. I already have 2 cars with mild 318 LA builds which are plenty fun but sometimes I feel the need to go with more, which honestly, I'm really trying to talk myself into it. Other times I want to rebuild and heavily modify the six. Looking at the cost though and seeing your post I see where I can get more with less and have decided to use what I have and build from there. Of course there are questions and the first is.
You mention "Stock pistons flipped" ...what do you mean by that?
Thanks
Don't worry about flipping the pistons, stock pistons had an offset and people use to install them other way around thinking it might pick up power, Engine Masters Show debunked it.

Doesn't take much to make the stock shortblock into a strong performer, 4bbl cam (regrind) headers and. Heads since you don't have any Speed Master with the right rockers to work with magnums (push rod oiling). Should get you into the 400's hp depending on cam.