In my experience the typical motorhome engine pistons are .150-.155 in the hole. Stealth heads are 80cc ish.
The engines I’ve measured are more like 7.7-7.8 compression. Not the advertised 8.2.
I’m currently doing one with trick flows and had it decked .040. With a standard gasket I’m up to a whopping 8.9.
With your deal you’ll be around 8.3-8.5. If you use a thin gasket maybe a little more.
It’s something you’ll just have to live with if you don’t want to rebuild the short block.