Here's how you do it

You start with a 400 block because you want the B-engine mains. Make two 3/4" thick deck plates to adapt the Hemi heads to the wedge block while simultaneously bringing the deck up to standard RB height. You want that extra deck plate thickness so you have a better angle at grinding clearance for the pushrod in the block valley without hitting water. You also need the extra thickness for addressing the inner head stud mis-match, & oil drainback.

Bore the 400 block & the deck plates to accept sleeves pressed through BOTH the plates & block to get the bore down to 4.25". The cylinder walls will now be super thick & tied together nicely.

Next, take a B-engine crank & destroke/offset grind it down to big block Chevy size on the rods, taking it from 3.375" down to 3.21". This will yield a 364" engine with room to bore/hone during rebuilds.

With a 3.21" stroke, 7.1" rods, & a 10.725" total deck, the pistons can be a convenient stock or near-stock height, but will need a big-*** dome to make any compression. The typical 12.5:1 race hemi pistons might be a cheap route if you can come up with a 7.1" rod to handle the pin end at a price to make them worth it.

There you go, a wedge based 364" Gen II solution that might actually be cheaper than building the real deal. Go forth & go fast.