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Blacktop head is the same casting as red top but with more machining work done for the dual vvti, i dont think there is any difference in the oil passage between head and block.
there is a good thread on a uk gt-four forum where someone compares all the 3s blocks including the motorsport block and the beams is the same as the motorsport block, supposedly stronger than the st205 and st185 turbo blocks. Just the block though, not the pistons etc.
also there is some techincal documentation regarding the 1jz-gte engine and how when they added vvti to it they could change from twin to single turbo and gain low end torque, so there is some advantage to it.
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