how to get 400+ hp out of my stock 72 340????????????

ok, maybe all you gear heads can point me in the right direction.
i am taking a fellow members' advice and keeping the 72 340 that is in my 70 34 4 speed car. i am looking to push about 400 hp out of her.
what would be my best options to do? i really do not want to stroke it.

if you could answer these question would be great........... i want a very lopey cam also

1) what manifold?
2) CAN I KEEP THE STOCK MAIFOLDS, AND JUST HAVE MY PORTER PORT THEM OUT?
3) what cam
4)what pistons?
5) can i swap out the pistons with the engine in the car?
6)do i use my manual fuel pump or do i swap to my holley blue with a regulator?
7)can i still run 93 octane?
8) can i keep manual water pump or should i get electric?
( should i go with eddy's? or stay with the j-heads and have them ported and polished?
9) can i stay with the points distributer, or should i go with msd 6al?

i am sure i will have more questions, but that is it for now. if you see something that i am looking at wrong, please point me in the right direction. thanks in advance