383 w 200 shot of nitrous build

I have a really nice 68 notchback cuda with a DANA rear end and 8 point cage that I would like to drive around and drag race occasionally
My idea is to build a forged internal 450hp 383 with a 200 HP nitrous kit . I have the 383 already and this is my engine choice
Any suggestions are welcome
Whats the cheapest Heads I could use with this set-up ? CNC source? 906's
I have never built an NOS motor before