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Jack, no need to apologize, there are many things about the Holden engines I am not that savvy with myself. The integral head has the exhaust manifold and intake manifold cast as part of the cylinder head(non-removeable), while the earlier traditional head, has a removeable intake and exhaust manifold, just like the Holden heads have. All these early and late heads are all interchangeable with the integral type. you just have to acquire an intake and exhaust manifold additional if doing this. The lumps are what we use to create the short size radius in these heads, as they have a relatively flat port floor, and hardly any radius into the bowl area at all. There are two methods that are used to do this. One was developed by the late Kay Sissell, who was also acquainted with Mr. Duggan in Oz(sorry I don't know his first name). Sissell filled the intake port floor by brazing and building it up to to do this. A more user friendly method is to use a bolt-in lump, that is copied from the brazed styles profile, and is bolted in, and doesn't stress the head as much as the welding(brazing)process is prone to do.
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There's no such things as too much cam....only not enough engine!
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