how to make a 6.1 spin safely 7500 rpms?

the best way to take a gen3 hemi and make it spin to 7000 is to pull it out and put an LS in its place. Seriously, to spin a gen3 that high you will spend $5000 plus in valve train and you will be constantly spending money on springs and head work. Spend your money adding stroke, don't spin it anywhere near as hard. Save your engine and transmission. The harder it spins the harder it is on everything.