You're on your own then. Nobody makes on ots hood matching your description. It will have to be custom made. Most hoods are vented for turbo guys. V8 Miata owners use the Simpson Design hood only if they need the extra clearance.
You could probably cut a bulge from a stock hood and bondo/sand/paint over it to make it look bigger, or maybe even do it the oldschool way and roll a piece of metal to get a larger bulge, then weld it on.