Maximum Performance N/A 383 build. Input wanted from engine gurus.

Bewy said

You have picked the worst engine out of all the big blocks to power a heavy car; the 383/400 has the highest rod/stroke ratio of ALL the BBs, 1.88.

Far better to go with a stroker crank & use 383 rods [ H beams ].
The warning below about too much duration causing slower ETs applies to 383s as well as 440s.

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Too much duration causes slower et IF you just added a bigger cam and didn't do anything else to accommodate the additional duration.
Would be the same story with cylinder heads, put a bigger cylinder head on an engine without changing anything else to make it work it's best will definitely slow a car down.
Everything has to work together