AAQA cast all the max wedge blocks, yes. However, they also cast the heavy duty truck blocks. Which is why just having the AAQA by itself without the 730 series casting number means little.
All max wedges, 413/426s were notched. Regardless of valve size.
63 would have been the 426 Max Wedge as the 413 had been retired from max wedge form. However, 413 production continued on for several years in standard form.
The webbings would be on the mains.
516 heads were the only standard big block head during that era. They were used on everything from the 361 to the 426.
As for the casting number, again, only one casting number was ever used for the 413 Max Wedge as verified by the Chrysler Museum. Yours, sadly, is not that. Not is it correct for a 1963 426 max wedge.
That said, the fact it’s in a motor home probably makes it a rather low mileage engine.
When you get it a part, take pics of the rods, crank and piston casting numbers. Those will put the mystery to rest one way or the other
