I think the point was that having a numbers matching 318, which is the best engine you could have in a '70 GT, is fairly meaningless for adding value. If the car is 100% stock it might add a little to the price, but really if you didn't have a numbers matching car you probably wouldn't do a 100% OE restoration on a 318 car anyway. If the car is modified much from stock it means pretty much zilch. Yeah, having a numbers matching 440, Hemi, or even a 340 makes a big difference to the sale price. And maybe someday it will mean more for a 318 car. Heck even the non A-body 383 cars aren't all that highly valued. From a collector's standpoint it would make more sense to have a matching numbers 318 car, since it might mean more later. But if you look at the market now it really doesn't make the car worth a heck of a lot more. Still just a 318, and if you want it to mean anything that means it's still got a 2 barrel manifold and carb because it would need to be all OE for anyone to even care.
And, all the 70/71 GT's were bucket seat cars. The buckets were pretty much the entire GT package for '70/'71. They got buckets and they got a GT emblem. That was pretty much the whole option package. According to the old registry information I got from Bruce for '70 only about half the cars had consoles. In '71 the majority of them had consoles, but there were still a few without. They also got the woodgrain dash trim option, and they didn't get the rallye dash.
For '70
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For '71. They didn't show the rocker trim in the brochure, but the GT emblem went to the rocker and had a 1 year only emblem, unlike the '70 (which was the same as the '69 emblem, just on the quarter panel)
Here's the emblem
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