Just recieved my dougs d450 headers Wowwww

just received my headers for the 273 dartcharger..
They are a work of art.
love them !
What do you guys think of them ?

Do you guys remember which oil filter adapter it requires ?
instructions says straight but sures appears the 90* will work also.
Building a 408 for my 66 dart and need headers but dont want fenderwell headers. Not many options out there. Are these my best bet to try?? Any advantages over the tti beaders??