Any recommendations for building a '73 340?

Why 400hp ??
Just cause it's a round number or you actually need 400hp. Just asking cause there's a big difference in cost and streetability between a 350 ish hp and 400hp. Pretty much a stock long block with 650 4 bbl, stock or better intake, cam 270 ish (high lift comp/voodoo) & headers. 9:1 cr would be nice to.

400hp need to get cr up to 10:1, head work, 285 ish cam and 750 and airgap. plus stall speed, rear gears etc...