I have a line on a 66' 911 front hubs. I have a 1970 1.7.

Anyone know if these would work? What year range would work for a swap. I have the five lug conversion kit now, which came with the car.

I have also heard mixed things about drilling out the rear? Any experiences both positive or negative with drilling out the rears?

Negative....those are solid rotor hubs.
You need struts and hubs to do this conversion, you can't put 911 hubs on 914/4 struts.

If only !
Nope, whole strut to use those hubs.

And you don't want the early struts with the funky ball joints and A arms.