Be careful about how rigid you make the hood. It is supposed to have some amount of flex. The hood on my 3A was beefed up with a couple braces and now it doesn't fit correctly.
The braces are tough to see in this pic but one is a piece of angle iron welded over the original hat channel piece up near the firewall end of the hood. There's another flat-bar brace welded to the hood about where it rests on the grill.

It's so rigid now that there is a sizable gap between it and the fenders. If you are going to add a brace, make sure the hood is in the proper "flexed" position before you do it or you'll end up with this:
