Excellent!
I used to cast stuff back in school, based on that I'd say the casting would be even easier with 3 downspouts (eg 1 for each of 3 possible carb pads.....)
Since these freeze last, it would be easier with 3 spouts to change carb pad types (eg Roch 1v vs 2gc pads) without having casting troubles.
Also, what about water cooling?
I hate exhaust cooling as it corrodes/erodes alum intakes.
And, I would add some "bosses" for bolting carb linkage, maybe the original bosses on the side for using the stock linkage and powerglide stuff, etc, and on the top where the later 292 throttle cable mounts. It's tough when you have no bosses in the intake cuz the head/block are pretty sparse too, no place to solid mount anything. It kinda helps to think out any thick bosses first cuz you can have shrinkage/coldshuts (lack of metal fill) in those heavy areas and may need chills there in the design.
Should be relatively easy to offer a 1*2v, 3*2v, and 3*1v intake this way!
After many requests to produce one for these engines, here is the first rendering of the prototype. It will use the Rochester style 2G carbs. From here the patternmaking begins.
