I agree fully. Mis-matched between 340/360 intakes to small port 273/318 heads just never sat well with me either. Aftermarket manifolds sold now dont port match to 318/273, which is why I bought a LD4B years ago and keep it. If I sell a car, I'll spend the $$ to get an Edelbrock performer which the new ones dont match or a Cast iron 360 4bbl manifold to go with the car and keep mine for my next project.
I also have the original Cast Iron manifold for my 273, and recently picked up a second one on a spare engine I bought for parts. Thats the only Small Port manifold I like better than the LD4B. But I am a bit biased and set in my ways. I havent had my hands on a '64/65 Offy 273 Dual Quad yet, I think that would be my new fav if one ever fell into my lap.