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SO..Does that mean that the 6.4 block could become available? What are the differences?

THe 2 major differences if iam not mistaken is

1. The Bore size

2. The Cam tunnel newer 5.7 and 6.4 uses a different cam core b/c of the VVT. Last time i check cams choices were far less since must "aftermarket" cams for them are reground stock cams.

Also as of now there is no aftermarket computer that can control the VVT. However the name of the company escapes me right now but there is a way to lock the VVT so you don't have to worry about that. Check the LX forum for more info on locking the VVT a bunch of guys are doing it over there.