I'll pick off a couple and leave some for others.

The GMC engine is the "mighty" 306 V6. Or should I say two of them?

Your Ranchero is a "home built", using Edsel wagon quarters. Despite "urban legend" Ford did not produce Edsel rancheros.

The others are pretty easy, although the red rig does have the non-factory "aero" kit. It might be fun to see how many people know what it's most unique feature was (moreso than the obvious powertrain).