I run 1 7/8 headers on a 440.1 3/4 will work fine and probably fit better.You won't lose much and you are not going to the track anyway.
I have always used Hooker or tti.The hedman elites are a nice 1 3/4 header.Doug's are good as well.Buy which ever one you can get the best deal on.
Try jet-hot's website.They usually have some in stock already coated for a discount.
Nice car btw!