I have a 59 364 Buick Nailhead I might use in a project, but it has the enclosed driveshaft trans. Info I found here showed the 400 trans. used 64-66 would fit the 364 without too much trouble and 65-66 were better than 64s. I have been looking for a 65-6 for parts and found a 67 Electra but passed because I figured that would not be a Nailhead and most likely a 430. Now, I have read the the switch pitch was used in 67 also. Is that so and if it is, will that bolt up to the Nailhead engines? Thanks in advance for any advice.