Upgrading help.

I have a 72 225 slant six that is is my duster. Wanting to upgrade a few things for a little more fun but not sure where to get stuff from. I was thinking intake, carb, and headers? What does everyone out there recommend. Nothing major just simple seeing as I have a 340 I will build for this one one day. I'm not even sure who makes upgrade parts for these and where to get them. What's everyone's thoughts?
I also need the throttle cable bracket for this 72 225 if anyone has one out there one they would like to get rid of.
Thanks in advance.!