I race a TR8 in SCCA ITS racing. I drove the car on the street for about 6 months before converting it over, and also had a 75 TR7 back in 85-87. I've driven Bs, Spits, have a 73 TR6 street car right now as well.
As someone posted above, the 7/8 BY FAR was the best handling - both from a performance and just comfort/driveability -- standpoint LBC before they all passed into oblivion. Yes, it wallowed some, but as far as stock handling goes they were the best.
When modded, they do fine, and I am sure are the equal of if not better than a modded B. The street cars are horribly undersprung. For track work, 550-600 lbs springs up front work (probably 4X the stock stuff), 250-300lb springs in the rear. Spend big dollars on the front dampers to help with controlling those springs -- I have custom valved Konis that cost about $400/corner. You need a bigger front sway to keep the car from rolling over on the loaded front cornering wheel, and the strut bar helps with this too. Rear sway I think you can ditch, but working on this -- helps with rear grip to ditch it as it softens the rear some.
Last, a panhard bar or "tri link" to locate the rear axle is a huge benefit, plus a LSD of some sort (you can still find the Salisbury everyonce in a while, and Quaifes are still available).
Have fun; great cars when modded up suspension wise.