Probably get as many opinions as there are a holes.
If you want an off the shelf item, I would call Eric Jackson (VintageMusclecar).
http://www.vintagemusclecarparts.com/
If you are willing to go custom, contact Chris Straub at Straub Technologies.
https://straubtechnologies.com/
These guys deal with so many different combinations that they will have insight that most won't. A friend that happened to have a good / bad experience with a particular camshaft may not have the exact same combo you are putting together.
Sounds like ton of fun in a Nova.