https://youtu.be/OOCUc_HFmZs?si=8BbBZ29B3ss5U3Aq

What's the difference between a 230 400 block and a motor home block?

Well, there is such a thing as a "motorhome" block. It means it came in a motorhome. But I don't guess it's any better than a regular block. It is made from the same casting. It is described in the Mopar B/RB handbook. It has 2 "steam holes" in the deck under each exhaust port similar to a 426 Hemi. This is why those 2 holes are there when you buy a head gasket for a wedge. (Look at your wedge head gasket.) But that doesn't mean that all motorhomes had a "motorhome block". Don't confuse this with the Very Heavy Main Web 230 block that was made up until approximately 10-10-71. Which is what you should use to build a 1000 horsepower wedge if you are not using an aftermarket block.

No such thing as a motorhome block but I'm not going to bash those guys too hard since they are running a lot of my parts on that engine!
Chrysler just produced blocks. Some went into cars, some into police cars, some into trucks, some into motorhomes. The same exact castings got used everywhere. Some got stamped HP, some got stamped T, etc.