need help on Edelbrock intake mounts/ports

^^^ What you have labeled as "heater return" in two places are not "returns" but supply ports. The return would be to the water pump or to the radiator.

GM transmissions don't use vacuum-powered kickdowns. You mean "vacuum modulator".

Ideally, a power brake booster would be fed with a larger-than-1/8" FPT port.

 

They forgot to label that big hole in the middle???

 

Thank you, Schurkey... And all others. Those are the kind of inputs I was looking for.
I revised the "heater return" and "vacuum kick-down" ID's in the illustration (in my original post) to read "heater source" and "vac modulator", respectively. I thought the same thing about the small power brake vacuum port size, but it matches the size of the port in my stock (and TA) Buick 350 manifolds.

Anyway, let me know what you think of the revised illustration.

 

Thanks for this!