Redfish thanks so much for the replies and the advice on the trim and header panel it's well taken
I have the installed the header panel and the gaps look ok on it also so maybe I'm almost there
You're welcome. Just sharing what I've learned over several years.
Here's one more little tip... Installing the grilles on the car is a chore.
The header panel all bolted in tight becomes quite rigid so all the gaps around the grilles may not want to close.
To paint the header panel off the car will make it much easier to install the grilles and get a good fit. Then hang it as a assembly.
You'll need to tweak the headers bolt ears a little so they dont scratch the fenders on the way in and have a good assistant.
Either method works though. You'll have to decide which is best for you.