Finishing up a pine t&g finish on a vaulted ceiling.  The inside is a 3.5/12.  I would like to finish the peak off with 4″ wide board running the length of the peak.  My problem is the angle cut necessary to get a clean finish is far beyond a 45.

Question-  Before I rack my brain and trial and error it, is there a “simple” way I can set up a jig for my table saw that will allow me to run boards through so I can get that >45 degree angle cut?

As always, thanks for the help.

Skippy