Trying to get 400hp from a 360

70aarcuda said
use KB107 pistons..
edelbrock air gap intake..

get a set of RHS/Indy heads from IMM...

holley 750 DP carb..

And a 275HL comp cam, 1.6 rockers, and GOOD machine work.
I recommend the Scat I beam rods and a good balance job, but if that puts you over budget you can use stock rods with arp bolts.
Brian