71 4dr Dart 318 w 4bbl

Just got the car. First Mopar! Ran rough when I picked it up so gave a basic tune up. Replaced air file and oil filters. Oil. Distributor cap and rotor. Plugs. Wires. Valve gaskets. Some light decreasing to see what I was working with.
Its a solid fairly recently rebuilt motor. Nice clean light grey inside the valves.

To the questions. This is my daily driver now.
In the trunk were some parts. Included was a cam the guy removed from his 340. Its a Comp Cam 260H hydrolic flat tappet. (Good for street daily driver economy?)
What else will/should I replace when installing?

Have a line on a weiland action plus. (Will get gaskets and what not for install) okay to buy used?

The exhaust doesn't look stock. Sounds great. Inline glass pack looks. Home job. Will likely replace soon with a 2.25 or 2.5. No emmission controll in CA pre 74 so whoohoo!

Will add electronic ignition when putting these on. Prefered there?

What else should I do while doing this. Not strip. Some freeway. Don't want gutless wonder. Want a spirited responsive drive.