It would defo be a good idea to get the best, but would still work okay with the std pulleys as they are keyed in to this when profiling the cams, the verniers give the option of dialling in and moving either way by small increments to try to extract every last drop.
The first thing I always do is establish the TRUE TDC, ie don't beleive the crank pulley, it may be right but costs nothing to check.
Then attach a degree disc, with a wire pointwer fixed over it, you will find TDC, as shown on the DTI in plug hole will occupy a few degrees say 4-6(example only) thus your true tdc is midpoint between these, I call this the rock as the rod changes stroke, find the rock on the cams also, middle point again, then you have refference points from where to set the cam manufacturers figures.
This will get you pretty close, but thw hole point of a cam swing si to see if a llittle more/less advance retard ups power or makes for a better torque spread etc.
So as you see not hard a bit time consuming, but well worth doing, but as I said there is the cheat way, ifbeing swung/dialled in on rollers anyway, would be ok.
tabetha