Agreed - if you're stopping for a bite to eat in Tyndrum, head for the Real Food Café which is across, and just down the road from the Green Welly.
One of my favourite bits of road up that way is the A85 going west from Tyndrum to Connel. Amazing surface, relatively little traffic and twisties galore.
Here's a wee clip of the road (taken from a mates bike) from FW to Mallaig ridden a few years back...watching it I want to go back over again!!