What to do???? What to do?????

Well my 69 Swinger340 is now just about out of the paint shop and ready for motor and trans install. Here comes the age old question. What is your opinion on header brand? It had blackjacks (which were garbage). Looking for ease of installment as #1 priority. What do you Dart guys think?
Also any ideas on mufflers??? Thanks in advance for your opinions.