360 vs 383

Yup!
I always tell my adult sons this: Stock means diddly squat, it's what you build not buy.
Awhile back I saw a yellow 1975 Pontiac Trans Am for sale with a 455 "HO". in the late 90's, my brother almost bought it, I like Pontiacs but stuck to Mopars.
Factory rated at a whopping 200 HP and 330 ft lbs of torque stock.
1/4 mile in 16.12 seconds... Talk about a turd.
*Edit* Also those Trans am's were a portly 3700+ lbs.
that motor was a dog
To be fair that was t/400 with 2.56 gears
From a 90 mph roll on the hi-way it would have dusted most everything in 75
My buddys 76 ta 400 4spd with nothing but headers ran 14.5@98 with 3.23s i think it had pretty nice handling car not bad for a 400 smog motor in a boat