Late A headers on an early A (smallblock)

dual exhaust with the stock 273 manifolds will work pretty good;
with the least amount of work.

If your going Racing that is not going to make as much
extra power as you want. ;)

I built a 318 and used the 273 manifolds worked good for me.

[ame="http://www.youtube.com/watch?v=Ud8mci4rjFU"]1964 Valiant dual exhaust - YouTube[/ame]