66 Dart Help Needed

2-Dart, sorry I miss quoted as it is just a 270 2 door. Yes I am going to a lot of trouble to only race 2 or 3 times but i plan on driving it on the street as well. I fully expect to throw money into it that I wont ever get back but Im ok with that. I really like this body style and I had one back in the early 80's. I am finding out that I will probably end up going with a 360 because of header selection. Ive contacted Hooker, TTI, Hedman and Doug Thorley and no one has a header that will fit. Only choices are to piece together one if I go the 400 route! And Im not sure that would work either. Thanks for the info on the front disc brake set up. I'll keep my eyes open for the 73-75 duster or something on that line!
Rodney