This shows the diff between a 2015 Challenger and a 1970.....
Challenger
SE, SXT
Charger R/T
Scat Pack
1970 Dodge
Challenger
0-60
~6.6 ?
“Mid 5s”
n/a
Horsepower/Torque
305 / 268
372-375 / 400-410
470 / 470
425/490
Mileage
TBD
TBD
TBD
n/a
Wheelbase
116”
120"
120”
110
Length
197.7
200.1"
?
191.3
Width
75.7
74.5"
?
76.1
Height
57.0
58.2"
?
50.9
Track
63.1
63"
?
60.7
Weight (lb)
3,834
4,082
?
to 3,336
2014 Chall. weight
3,720
4,132
? (vs SRT)
Weight distribution
52/48
54/46
?
1970 Mustang
Wheelbase
108 in (2,743 mm)
Length
187.5 in (4,762 mm)
Width
71.7 in (1,821 mm)
Height
50.5 in (1,283 mm)
Curb weight
3,122 lb (1,416 kg) (base)[50]
2015 Mustang
Wheelbase 1 0 7 .1
Overall length 1 8 8 .3
Overall width 7 5 .4
Overall height 5 4 .4
Track, front/rear 6 2 .3/64.9
The '70 Challenger was bigger than the '70 Mustang, so I don't think the new Challenger isn't all that far out of place. The new Mustang is very close to the same size as the '70 model.
I'd love to have a recent Challenger in the driveway to go with the 2017 300S we enjoy cruising in.