Hypothetical build questions…

LOL!!!
Really? The speed limit didn’t drop until the Carter administration and national disgrace didn’t start until 1977.
Yeah, all the great engines were built, sold, & disco'd by the time the Nat'l gyped-t-five speed limit & 85mph speedos were forced on us. The great thing about the Mopar digital dashes in the '80's was if You pulled out the cluster, there was a little slide switch on the back marked "US" & "Export", slide it on over to "Export" and the mph kept climbing past 85. My '84 LaserXE TurboI went 114mph BTW.