For what it's worth, a friend of mine converted his 4.6 racer to wishbone front suspension (provenance of the set-up unknown to me) and it really wasn't very successful - the handling was unpredictable, even after having a detailed review and consultation with the chap who made Terrapin hillclimb/sprint single seaters (IIRCC Alan Staniforth). I drove the car in its wishbone form and it definitely didn't gel for me. The car was eventually sold, and was converted by the next owner back to sliding pillar.......
Dave
