Plug suggestions for my build

The exact compression ratio you have would be important information to list and not have us guess or mathematically figure out. List what line of camshaft your using is useless information but the actual specs are needed.

For a ballpark and what I do mostly is start with the stock heat range plug and work from there.

The higher the performance the engine it is the colder the plug will get. As a basic idea and still in the dark as per your description, perhaps a 1 step cooler plug might work. But you left out so much critical information. Start with the stock heat range.