Thanks Matty,we think it's all good now...after a blast around the block.I changed brake guys and it appears one of the drums had developed a fair amount of run out,probabbly caused by a suspect inner wheel bearing actually rotating inside the hub,which has also been replaced.
Next outing is Pittsworth Sprints September 6th with a big stop at the end of the straight,this will be the acid test...fingers crossed.
You fellas who don't know the car...Wheels are 10x6 inch mini rims with machined down Datsun centres inserted.This assists with CG movement and makes for a suuuper short final drive ratio when hooked to a 4.1 locked,and it's just how i like it on the short tracks.