Just wondering if this would matter much? Im gonna install a proportioning valve near the rear if i need too, but just but a brass T in place of the delay/proportioning valve located on the master cylinder. Car wont be driven much, and I figure it would only help with emergency braking, or fast braking right?

It mostly helps with light braking, and in ice and snow, by delaying action of front brakes so front and rears apply at the same time, or rears slightly first.

If you use your brakes lightly, with long, slow stops, or use your left foot hovering on the brakes, you wont get much if any use of the rears without this valve, and might develop fast front pad wear and dust.

In snow/ice, it helps kkeep the fronts from locking under light pressure, and helps keep the back end from swinging out while stopped at a light.
Without it, the front brakes might hold you still on the snow, but the rear could swing out due to the monstrous amounts of low end torque from your big block overcoming the little-to-no pressure being yet applied to the rear.

So if you dont drive on snow and ice, and stop moderately or hard most of the time, you dont really need it. It doesnt do much if anything for brake dive as commonly thought. That's mostly in the suspension.

I had mine out for a couple of years after my old delay/metering valve went bad. There weren't any safety issues, but I could feel the transitioning of the back brakes coming on first, then the fronts coming on. Mostly, it was barely noticeable.

I don't know if it will help, but i will be installing a 10lb residual pressure valve as well as an adjustabel proportioning valve on the rear lines, with no valve at all in the front. Hopefully that will help a little and it saves me over 100 bux for now and ill add the delay/metering valve later.