1975 C10 350 Exhaust

[dopeeye]

1975 C10 350 AT PS
This car is completely stock.
I am contemplating getting dual exhaust on the truck and wondering if i should put headers on while I am at it.
Could I go in stages and get a dual exhaust that fits on the stock cast iron headers and then can later be easily modified if i want new headers?

I will be using it as my daily driver and hoping to get some improvement on the gas mileage.

Thanks

[Captkaos]

Generally speaking you won't be able to do that unless you really plan ahead...