67 cuda instrument cluster

Well, there are more screws than the ones you can see from the front. You need to look at the bottom and the back. The heater controls are a big chunk attached to the back, as well.

The 1967 Plymouth service manual was released before the Barrracuda introduction, so they had to issue a separate supplement for Barracudas. But a 1968 Plymouth manual would have everything you needed, with a few tiny changes (radio is different).

I have a scanned copy of the Barracuda supplement -- it's way too big to email, but I'll just extract the dash-related pages and post them here.