It is for the velocity stacks though and is as much as for a collector of the unburned fuel pushed back through the carbs as for keeping stuff out. If you don't then you will have a fire hazard.
You need to cover the screens to keep water out also. Separately.
The "plate" needs to be bent down about 3" as well and the simplest way to do that is to use clear 1/4" lexan and bend it down over a form using a heat gun.
The velocity stacks should be 6" tall. That will put the openings up to around 1-1/2" of the underside of the roof. That will reduce the consideration for all but the two stacks that are not covered by the roof or deck roof extension. Just keep the thing out of automatic car washes.
Those aren't made by anyone that you can buy premade.
You can get 5" or 6-1/2". The 6-1/2" are a little too close to the bottom of the roof.
JimInglese.com has the 5" spun aluminum in stock and can order a set of the 6-1/2" but not 6".
If you notice in the picture, the stock steel velocity stacks have been extended to make them taller. These are in the 5" tall vicinity.
This was common practice back in the day. You needed to cannibalize one set of stacks and solder them to a stock set. There wasn't anyone making aftermarket spun aluminum stacks for the carbs back then.
The problem with covering the carbs with anything is that it is so tight and close in there, you won't be able to get at the linkake easily and you will need to disassemble anything you make for them.
You need access to the top of the stacks to sync the carbs and the turkey tray, seem in this picture, really does not work well at all because of inaccessibility to the carbs. It is intended to isolate the carbs from engine compartment heat. Particularly from the heat of the headers. It is not what you want to do on a Pantera with webers and 180 headers. You need instant access to these carbs and instant visual access to see what is going on with them at any particular moment.
Covering them with anything CAN BE a problem unless it is done esentially like using tear off clothes some of the strippers and athletes use. Try and figure that out using rigid materials and bolts and screws?
Mine screens are being covered with little aluminum sheet metal roofs on standoffs over the jet screens and the stacks sit up under my rear louvers. In my case the louvres are functional because of the carbs and not just dress up items.
I've been working on the Lexan cover on and off but haven't arrived at a final shape and more importantly a mounting that will just unclip, i.e., tear off, in a couple of seconds for quick road access.
No pictures to show you at the moment. This stuff is in progress and never seems to get finalized, but logically it will at some point unless of course I don't live long enough to finalize it. It isn't easy to do. Webers and 180 headers on these cars do have collateral effects and when the factory was racing them these were only incidental details at most.
