I like Bossman's ideas. They always seem to be good.
I always thought that someone should make a valley cover ( adapter plate ) so you could bolt up any Chevy small block intake or maybe a big block intake instead.
I guess it wouldn't have to be a Chevy intake either. If the Mopar ones would work better than that would be ok too.
The only reason why I said small block Chevy is because you would have tons of choices and the cost of the intakes would be cheaper.
Looking at the Z-11 intakes maybe GM figured it out for us already. Someone could make a 2 piece kit and have multiple choices for carbs.
The valley pan would be the same for all the 348 and 409 engines but the intake top could have one 4 barrel or two 4 barrel configurations. A guy could
even have one with 3 deuces or whatever.