Converting '68 GMC to '67-'68 Chevy grill

[68GMCCustom]

I just purchased a '67-'68 Chevy grill for my '68 GMC. It comes with the front parking/turn signals and the trim. I am guessing all I will need is the headlight trim bezels to finish the appearance side but am wondering about the "behind the scenes" work in this conversion process. What will I need to do, to adapt this grill and 2 headlight system... to my 4 headlight system GMC?

I have a '72 C10 to scavenge the lighting harness off of if needed and noticed my GMC's wiring includes a relay or something on the radiator support. Can I use my '68 GMC radiator support? I am guessing I just remove the high beams and leave those mounting buckets hidden behind the grill, and then change the wiring? How about the center support brace that the hood latch and everything mounts to? And since its still a GMC (just with a Chevy grill) what year GMC emblem might work good in the two holes left in the grill from the bowtie emblem? One off a '99-'06 GMC?

my new grill (its just the wrong color):



Thanks for any and all assistance!