SBC 350-T350-9" 32 highboys usually come in at 2200-2300#.
With 2300# being the usual.

Length with front frame horns and bobbed rear frame horns is right at 12'.
that includes the gasser style rear bumper.
(Cars similar to a 50 Plymouth coupe are about 16' long.)

Maximum width on my 32 with it's fat rear tires on 10" wide wheels is 71 1/2".

I've had no problems in loading the car onto a flatbed trailer or an enclosed trailer.
The flatbed had 6' long, 18" wide aluminum ramps.

The 20' - which is 20' 6" inside - enclosed box trailer's rear door swings down and is used as a loading ramp.

The 32 isn't real low, but the collectors are 5" off the ground and the car has never dragged.
Over speed bumps, driveways or on both trailers.

You definitely want trailer brakes.
On both axles.

My flatbed had brakes on the front axle only and the one emergency stop I did had the trailer brakes locked and it took forever to get things slowed down.

The enclosed trailer has four wheel brakes and even though heavier, stops pretty good.

The 20' box trailer weighs right at 3000# empty and when the car is aboard it will gross out at 5300# if nothing else is in the trailer.

I've had my trailer loaded right at the gross of 7000# and it did well.

If you're buying a box trailer think about adding a winch.
A mechanical boat winch on a stand is easy to use and a good way to go.

Add a potty room as well.
I did on mine, it didn't add much weight, maybe 65# at the most - including the potty charged with water.
I was careful to use lightweight materials.

The potty room doesn't impinge on space much at all and it's been handy.
The girls much prefer it to the green boxes you find at the race tracks.
And they especially appreciate it when on the road.

Pics of the winch and/or potty room if you like....