The 'claw' part that bolts to the block is longer than a small block claw. The mounting place on the block is a little different as well for this style mount. Something can be made to work, but it will not be a simple affair, even if you have the slant six claw. The later 'claw style' does not directly fit the earlier style blocks but the earlier style mounts will work on any block because the bolt hole on the block is in the same place. I have pictures somewhere of the differences. I have a 79 block that was made for the claw style mounts and I prefer that style for the ease of timing adjustments (greater range).
