Yep....just like haysonj said....that's the 67/68 accelerator....
I'm thinking about modifying mine to be a 71/72 accelerator by following this great how-to Putter did awhile back
http://67-72chevytrucks.com/vboard/s...00#post1383300
Else, you'll have to see if those stud mounting holes are there to install it correctly....