67 camaro odd grill question.

[XLexusTech]

So 67 standard grill (non RS). I purchased a billet replacement grill Like this one and I bought the stock upper and lower fillers. I think I am going to have a problem because I also replaced the lower valance with one I made grafting in a 69 valance lights into a 67 valance like this.. Valance like this.. so Now I am worried will I be able to bolt the grill in?

Is there an order for doing a grill can you bolt the whole thing together and install if you have the header panel off ? or its it one piece at a time?

What is the process for a stock grill ? PS I have the fisher book and it does not answer this question. I looked..