Yes, I agree with that 6 cylinder Texas guy, 216s and 235 manifolds are different. Easy way to tell a 235 intake, looks like a big gorilla twisted the thing vs the straight 216 unit. Also the intake runners on the 216 are a bit smaller. I used a 216 dual intake with my 261 for a long time, with Fenton headers. These manifolds will interchange 235 to 216 as long as you stick with the same intake AND exhaust, as a set.
