Building a 350

[Smokin86]

Hey everyone. I'm a newbie here. I am trying to decide how to build a 350 for my truck. My tentative plans are as follows:

Rebuilt stock 350 shortblock except better pistons.
Vortec heads with upgraded springs (probably from Scoggin Dickey)
Edelbrock Performer RPM Intake
Stock GM HEI Distributor
Edelbrock 1904 Carb
Comp XE268H cam
1.5 or 1.6 rockers
Hedman Ellite Headers 1 5/8" primaries w/3" collectors

What do you guys think? I know I have left things out. That is why i am asking you guys.

I want at or near 400hp/tq with pump gas. I need some serious advice on what piston to use and 1.5 vs 1.6 rockers.

Thanks