how much power and rev you looking at? if around 300-350hp the atpturbo.com gt28rs would be nice but then you say you have a t28 flange... bugger cos its a t3.
if not looking at a t3 manifold or even change the flange the max id go is a gt2871r
yes they love the skunk pro 1 cams an upgrade from the itr cams, although they are much much harsher on the valve train, there are other cams that would work well too.
even Ti retainers cop a beating, many on H-T in the states have have heaps of wear on their TI retainers (supertech and i believe skunk2 brands) at around 10 to 20 mi. Keep a regular check on the wear of the retainers, make sure the springs seat up to the retainers properly else will have some nice FAIL! supertech make some nice cromo retainers too, its all go to do with the spring being stainless or steel and the different metal ie Ti of the retainer and they way the springs meet up to the retainer. Anyway keep check on you valvetrain when using harsh cams - as with anything.
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