Lugnutz, I know you are looking at new manifolds, but what about considering good, used units? The '58-'65 3747038 casting is common, has 1.9" outlet, three studs, and can be used on either right or left side (the casting is marked RH), if the alternator mount isn't needed. If the alternator mount is needed, a suitable LH casting number is 3749965. These aren't the only 1.9-2" outlet castings, just a couple that are common.
There are a number of these castings listed on eBay, some are heavily rusted, but its not uncommon to find them in great shape, for $30-$40 each, maybe a bit more.
Maybe an option.
Doug
