Michael,
Martin Krejci's brother Roman has some hillclimb results here:
http://isr.cudlici.com/
But I haven't checked for Zaborowski. I have the same mixture of cars for him in my results, the only definite T280 entry I had for him was Mainz in 1976. He was entered in at least 1 race in 1977 by "GRS International Racing" which I thought was linked to GRD when ran F2 & F3 in the early 70s.