I just spent 2.5 hrs cleaning and painting my ('50 216) Intake/Exhaust Manifold that's in excellent shape to put on my fresh (235) with a '59 head.
When it came time to install the Intake Rings.......you guessed it, they didn't fit. Early 50's 216 manifold has smaller ports than Late 50's 235 head.
The Manifold on my (core) 235 is "toast", that's why I was wanting to use the 216 Manifold.

I read that you can put the (216) manifold on the (235) head without installing the Intake Rings. Kind of "Mickey Mouse" (but if it works....)
What would be the "Cons" to doing this? I not concerned about performance.
I did see an earlier Post here by "Big Tee" (post # 729906), a few years back he was doing this very same thing but (if I remember right)
I believe he was planning to ream out the Intake manifold to accept the larger Rings. I plan to PM him.

what do you think? Can I use my 216 without the Intake Rings?
Jim