Redline still did the extra top link kit with negative wishbones about 18 months ago when we did my Dad's HPC, was fairly reasonably priced IIRC. It works very well based on my short trip out in the car last summer, much better than the original set up on my Classic, and (fairly) easily reversible in the unlikely event that you'd want to go back. Otherwise, I'd agree, try to keep it original, they may not be the fastest anymore, but they are special cars, and I suspect the value of the engines has made the survival rate lower than other quick 7s - I recall some club members telling me that they knew of a few people years ago who bought BDR cars, sold the engines for a nice wedge, then put a crossflow in and sold the car for not much less than they'd paid for them!