Looking for a double roller for a slant 6

Hi everybody. I am having to learn about slant 6's as my ex's 64 Dart is broken down in my back yard, and I need to get it out of here as it is blocking the entrance to my back garage where all MY toys are.

I found a 68 slant 6 with 49 k original miles that I am trying to "freshen up" before I install it. I am going to replace the freeze plugs and timing chain, possibly a bigger cam - not sure yet. Then install it in the car to get it running.

Does anybody know where to get a good double roller timing chain (even a true roller would be nice) for the slant 6? I have checked with Mancini and Summit, and they don't have any listings. If anyone has a listing for a slant 6 double roller or true roller double roller timing chain, I would appreciate the manufacturer name and part number if possible.

Also, if anyone has any good cam recommendations, I would like to hear about them. I am looking to give her a little more pick-up and still have good fuel economy. I'm thinking like around 250° - 260° duration. What kind of cams have you guys run in the slant 6, and how happy were you with them? We are looking to improve perfomance over stock and still keep fuel economy.