Remember that the original cams are designed some 40 years ago. The're modern camgrinds at the market which do much better then the D&K cam. A drawback is the costs, think about twice as much as the old cams. I really like the TT5 cam. Drove an amazon B18 with twin SU's and a 4-2-1. Very impressive torque in the low revs that kept on going and going till 5500rpm.
This TT5 set costs €225. If you choose for the original cams I would advice the D instead of the K. D has more torque in the lower revs, the K has more power in the higher revs but not that much. In every day use the D is more fun.
It's a pitty this dutch site isn't available in english;
http://www.tinustechniek.nl/1-onderdelen-motor-int.html