Thanks to both of you for your replies.
Know the Ayer shop well - great reputation - I have no reservations about going to them - plan to ask them to quote IMS replacement.
I think I'll skip the chip. Not only are the claims suspect, but the huge price discount can't mean anything positive.....
I am planning to use the Lucas stabilizer, though. It has worked wonders in other applications. If my results are significant (positive or negative), I'll follow up with a re-post.
Again, thanks. Now pray for an end to this very long and very miserable winter :ah: so I can put the Box back on the road!!