1968 Road Runner '383' vs. 1968 Chevelle 'SS 396'

I often found myself wishing that Ma-Mopar would have offered different versions of their engines like the General did. The General offered three different versions of the 396 (four if you count the lowly 265hp 2-barrel L66) in power ratings of 325hp, 350hp and 375hp. Would have been nice if Ma had something similar going on with the 383. You had to wait until '69 before you could get 375hp in an A-body when Ma finally stuffed the 440 in there for us, but of course with that heffer of an engine stuffed in there you couldn't get power brakes or steering with it. A "factory" "B75" (375hp 383 B-engine) would have been a sweet factory option!