Looks almost roomy in there. A 383 might give another 1" on each side. How much weight does the aluminum headers, water pump, and intake save? I would guess 150 lb and put it close to a stock SB.
Looks like front drum brakes, since no booster. I am guessing manual steering is all that clears the headers, and keeps things simple. Not a car a little girl could handle.
Will be nice to see the carb installed and if it clears the hood or you need a hole. That engine and intake is tall.