I think I see the problem. The front mounts where the 235 was do not seem to go to the 261. The 261 does have a place for side mounts, are there any types that can be made to fit the 58 chassis. I thought I saw a timing cover that might be able to attach the front mounts, does anyone know about the compatability of these? Thanks.

1958 Chevy Grumman Olson step van