Head, cam and Intake question

Use afr 185's,steeda #20 cam you may need different pistons for the cam im not sure

Mid 400HP, you're going to need nitrous or forced induction to get there with the parts you're listing. Any of the parts you listed plus a (take your pick of brand) supercharger will get you there and still be reliable if tuned properly. AFR 165's, Twisted Wedges, Edelbrock Performers, etc should all work just fine.

AFR 165's, Trickflow TW/Street Heats (if you want the smog provisions), or Edelbrock can be good bolt-ons.

The Trickflow allows you to run a 2.02" intake valve, while the other offerings may require you to use some clearancing, if you were to get a 2.02" valve in an AFR 165 or an Edelbrock Performer with a 2.02" valve.

The AFR 165's are nice, and have a 1.9" valve, as compared to the AFR 185's that have a 2.02" valve.

As stated, you would need nitrous or a supercharger/turbo combination in conjunction with your h/c/i swap. You typically will only see about 350 hp at the engine with a h/c/i swap. You can get aggressive and get near 400hp, but it takes more $.

A nice stroker can get you 400-430 horsepower at the crank, fairly easily. But that cost even more $.

I would go with a custom cam personally.