The 216 distributor will work fine if you change the cam gear with one from a 235 distributor. It's easy to do but of questionable benefit unless you are trying to utilize an otherwise junk 235 distributor or disguise the 235 as a 216.
I did that on my 235 using the 216 valve cover, distributor, re-located water pump (which you should consider doing) with wide belt, vibration damper, generator, glass bowl fuel pump, and welded a bracket on the intake for horn mounting. A knowledgeable person can still quickly tell its a 235 but most people cannot. I was going for an original look as possible.
