Eman,
2 basic methods of doing this:
1.) small base circle cam which allows use of stock (factory style)roller lifters, lifter guides (dogbones) and retainer (spider). You must also drill two very small holes in the lifter valley for the retainer and usually grind off the casting numbers there as well as the tops of one or two lifter bores if the factory casting causes the lifter guides to bind.
2.) use a standard base circle roller cam and special "link-bar" style lifters which do away with the need for the other roller hardware.
Check with the cam manufacturer for specifics, but steel cams require a steel distributor gear as well. This covers most rollers, but some of the retrofit roller cams actually use a cast iron gear.
Option 2 is simpler, but more costly. Many people will tell you that there is not much selection in small base circle cams but this is not so since most cam manufacturers will grind any cam pattern on a small base circle for a nominal extra charge.
Either conversion option requires you take a careful look at your rocker arm geometry once assembled and make sure you are using the correct length pushrod.
Lots of good articles on this upgrade available on the web.
Cheers,
Sean
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Mk III partial SN95 donor, 351W stroked & poked to 396 c.i., custom EFI, 4 into 4's, 3link, 3.73, chrome FR500's, full bumpers, 2 X roll bars, IČ electronics, hydroboost, 5-lug, GT front, MK VIII/Cobra rear discs, painted by SRP, (fully) legal and driving! Graduating...?
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