There are better ways up to Devils
Personally I would suggest you go upto Longridge then Claughton on Brock, Oakenclough, down towards Forton/Bay Horse and shoot across Quernmoor at silly grin inducing speed. all the way to Caton.
Then ignore direction sigh and turn left/right over the lune at Crook O Lune, first right and then hoon on the Nether Kellet Road all the way to Kirby lonsdale going through Arkholme etc.
see here
Using the A59/A65 is boring. If you must use the A65 go via Hurst Green, Warburton, Newton, Slaidburn upto Long Preston. The A65 from Gisburn upto Long Preston is generally a crawl stuck with double white line, nowhere to safely overtake and 30mph tourists with caravans.