In 1970 the F150 did not exist. The F100 shortbed (119in long) was a bit smaller than the Maverick (120in long). The F100 became the F150 in 1976 and the shortbed grew to 205in. The current 2024 shortbed is 209in long. Your 1990 extended cab F150 uses the longbed frame with a shortbed on it to end up at 216in long.Lets compare it to my 2nd truck.
1990 F150 extended cab
Length216.1 in.
Overall width without mirrors79.0 in.
Height74.6 in.
Wheelbase138.8 in.
2024 Maverick
Length 199.7 in.
Width, without mirrors 72.6 in.
Height 68.7 in.
Wheelbase 121.1 in.
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