The car is being built as a sleeper.

For starters.
The block Stock bottom end.
Head port&polish-oversized valves-3 angle valve grind
Cam Compcams 264S
offey 4bbl intake man.
Holley 390

my question is I would like to expand to Nitrous in the future. The stock bottom end should hold up right? Should I use the ARP connecting rod bolts or is that over kill. And will the Holley 390 be enough for the cam.
Thanks Michael

You have a good basic build-up listed, I would mill the head at least .060 to help compression.
The stock rod bolt will be OK but the ARP replacements are a lot stronger. Adding the stronger bolts is a good thing, especially if you need to resize the con rods anyway.
DD