Exhaust

What is the best fitting headers for a "A" body? 318 with a 904 transmission. Mufflers? I'm not looking for the glass pack sound, wanting the best performance from the exhaust system.

for a 67-up abody? tti or dougs headers will fit the best. mufflers are so subjective. everyone likes something different.. i like dynomax super turbos. friend has magnaflows that sound real good too.. may as well go 2 1/2" pipe while at it .