what's in your wallet?
you can spin a 302 block to 8000 easy enough, it's the peripherals that are gonna cost the money.
aftermarket 4 bolt block, 4.125+ bore to make the big valves breath, short piston to keep the wt. down which means long rod. i'm using 1.3 ch pistons and the pin is just below the
oil ring. internal balance doable?
good set of heads with pedestal mount rockers, ls1 springs & valves & retainers. prob have somebody build the heads to handle the rpm. afr has a new head at sema for sbf but haven't heard anything.
will need custom cam. blykins can get what you need through mike jones or go direct, he'll know what to do if you need the manifold vacuum or not. solid roller or hyd?
prob accel or fast for efi, something somebody can work with and tune.
i would get the piston/rod/crank relationship together to see what you can do if you're gonna spin it that high all day.
talked to a guy who raced 347's to 8000rpm and he was breaking the snouts off till he changed to belt drive cam, something to think about.
just a few thoughts. good luck.