1969 Swinger 340 distributor questions

Ultimately, my two major stumbling blocks are which holes in my firewall/fenders should NOT be there? Did you see the 3 holes on the cowl just above where the ballast Resistor mounts? All pix I see show only 1 hole up there for a wire clip. Have any idea what the other 2 holes are for, or are they from previous owners? Still trying to figure out if the 2 holes should be on my pass side inner fender in the pic above.

Second question is, will the single point 318 distributor I have work well with my 340? I am concerned about the advance curve. Can I simply buy new internals and rebuild it to 340 specs, and change the tag?
Any other input will be greatly appreciated. All your responses have been printed out and saved for future reference.

Thank You all for the help!

George

George ,I have no holes on the upper cowl area of my 68 where you have 3. There`s a wire loom that clips to the lip just below that. The regulator should bolt to the raised areas just below where the speedometer cable goes through the firewall. The holes on the passenger fender look about the correct distance for the old fashion Accel Super coil.??? Just a guess? If you really want to maintain the old look you can get an electronic conversion kit for your points distributor. Your work looks good, keep it up and post some pictures of your progress.