Thanks Tech. All the ones you posted have the rear entry rather than a carb on top. I read in a note somewhere that Magunson considered them to be more efficient than the top mounted carb. I think they will call for injection and computer control which is past what I want to do at this stage. I sure would like to find a manifold for the holley type.
Matt, Jerry passed away and we lost a bunch of knowledge with him. He had sold the Magna Charger company and it appears their only interest is selling the current kits, no parts. Sad. On the intake, I saw where Magunson adapted a lot of his early ones to standard 4bl manifolds like you are suggesting. That appears to be very doable. I also saw where for the late model kits such as GTO, Magna Charger is offering a snout support so there must be a reason. likely flex as you noted. When you were looking, what displacement did you feel there was a problem? The 350
Car Craft had great torque at low rpm and started to fall from 5000 on up (if I remember right). If that were hooked to a 383, any ideas on how that would position the torque/hp curves?

Mostly doing heavy day dreams here but sure would like tons of street torque.

Thanks for the comments and information.