Oil filter clamps. I admit that I cheated. The clamps for the 216 were to small for the 235 manifold, so I went to the hardware store and bought some. Bent them to fit the intake and painted them.
Manifold paint. The intake is supposed to be black on the trucks, blue on the cars. I used POR manifold paint and goofed. The can label didn't say that it had to be heated right after painting, so I waited a month after painting until I started the engine. I now have some rust bleeding through, but not much. From what I have been told since, all the manifold paints will rust through, but I think if I had baked the manifolds right after I painted them they would still be ok. My POR rep told me that when properly applied, their product doesn't rust through.
To remove old manifolds I use Kroil and heat when necessary. PB Blaster works good, too. The big problem is separating the manifolds, I have yet to get one apart without breaking a bolt. But that's life when you work on these old gals. I've been working on them since the mid 60's.
When putting them back together, don't use stainless bolts. I did and regretted it. Bought one of the engine bolt kits with bolts made in lower slobbovia. They weren't properly heat treated and the manifold heat made them hard and brittle. Also had problems with thread galling when using stainless bolts with stainless nuts, and I knew better than that. It would be okay to use a high quality stainless bolt (such as ARP) with known properties, but you will still need to use an alloy steel nut.
