The front half of the 1/72 Lockheed C-130 is slightly bigger than the circumference of the Monogram RB/B-36. Well the Heliplane served it's purpose I'll use the 1/72 Mil-26 Halo for the next one.
The wings from the AMT/ERTL Northrop YB-49 Flying Wing do fit the Peacemaker fuselage although this isn't a perfect fit with a bit of putty/filler this will blend in.
Well it certainly isn't the YB-60, Douglas had something very similar based on the C-133.
I might square off the vertical fin tail.
I know where I can get another B-36 from, so a four engined beastie shouldn't be too much of a problem.