I was on the Slant 6 forum, but now...

If you really plan on keeping the 2-barrel carb, headers are of no real use and would make the install quite a bit more difficult in an A-body.

But at the same time... keeping that 2-barrel means you will be leaving a lot on the table...!
I'm not interested in FAST, just enough power to let me know "there's a V8 under this hood!" I have had lots of V8's (mostly Chevy!) and there's just nothing more fun than romping on the right pedal and it jumps to life and gets you on down the road! I will not be racing it, or anything even close to that at all.