Yes to the 15x6" c-body rallye wheels

Yes, '73 rear defog used the blower type & '74 used both styles. What's the SPD? Is there a b'cast sheet?

Yes, all '74 Road Runner/GTX VIN#s start RM21 (coupe) & most if not all with power windows have 4 power windows.

What does the original color look like, any remnants under mouldings, rubber gaskets, package tray, or inside trunk?