Awesome, glad to hear your a man with a plan. She'll look twice as good with that "junk" behind the grille painted black, trust me.
You know what, if you had asked me about the flat black I would have said yes, but, after seeing yours, I'd say no. It's your car so do what you want etc etc but I feel if you do do it flat it will come off as an "In-between" AAR and bulge hood. Keep it gloss in my opinion. Your car's a "custom" tone anyway so I say keep the hood as is.
What are your wheel plans mate? Sticking with what you have or? Some 70 Rallyes would rock it, maybe SS Cragars are more to your liking, or, maybe your like me and love the dog dish cop wheel look?