Its interesting to note the following data on the cams:

The range of cams from Piper for the Cosworth Turbo (Fast road,Ultimate road,Rally & Race) all have a duration of 264deg.

The BD range however, have
241deg for the BD8
264deg for the BD10
247deg BD10
261deg BD14
258deg BD15
265deg BD16

So even here it can be seen that different designers have different idea's as to what cam profiles are best suited to the Cosworth engine

Piper cams told me the best cam change for the cossie (and most popular apparently) is the BD14 inlet and BD10 exhaust.