G'Day, am looking at getting an aftermarket cam for the XG.

Seriously contemplating the 2222549 Crow Cam:
Valve Timing in.24/66 ex.62/20
Dur in.270 ex.263
075dur in.210 ex 200
Valve Lift in..528 ex. .500

Or the Wade cam 1004-14:
http://www.wadecams.com/PoProf/Popularprof.htm


Running a full XR6 engine with 2.5" exhaust with pacemaker headers, and was wondering if I need the aftermarket springs and/or the shimms? From my understanding I don't need an aftermarket ecu with either...