Read through lhmurphys post about 406 build...whatdayathink.
Lots of good conversation about the tech aspect.
Your build recipie/goals are not plausible.
Cam wont support 8K rpm
Heads might...with tons of porting...if you dont ruin them
Rods will be hanging out of block at around 6500 rpm due to excess length(6.0 in) and weight Vs. velocity
Block will need decked, which means you need all parts going into to it, physically in your possesion, so you can measure the "stack" to give you a height that you need to deck the block to.
Lots more trouble here...too much to list.
Do some more reading, when you think you have read enough...read some more, then start asking some questions.
Not trying to be flip, you just need to read up and learn some more before you start dumping money into a build.
Fact is stranger than Fiction