Looks like you are going the same route I did when I did the disc brake conversion. Good selection!!!
I have re-posted below the thread that I submitted after my conversion.
I know it won't help you much as to a wheel selection for your car but I had a similar case of the wheel rubbing the caliper. As you will see from my post, it required only a VERY small grind off the caliper to allow the wheels to fit perfectly.
As I said in the post, I only know that the wheels I got were marked as 14" Ford but did the job perfectly after the grind.
Good luck Bill
Finally have the disc brake conversion completed & the bottom line is....it is just amazing the difference a decent brake system makes. I actually feel safe knowing I now have such improved stopping power.
Just to summarize the components I used:
ABS 8" booster & dual m/c (disc/drum) ABS Stock No 9787, Item No 270556931229.
This booster/m/c is designed for the '59 TBird with a/con. It comes complete with the bracket & is set to the correct angle so it clears the a/c unit etc. It also has the extended pedal rod so basically is a straight "bolt on" item.
Scarebird brackets Part No GXY.
Scarebird also supplied GM-S10 loaded calipers & brake hoses to suit
Rock Auto supplied '68 Mustang rotors. Part No 397 6006R.
By using the Scarebird brackets & Mustang rotors, I retained the OEM spindles & bearings.
As I said in an earlier thread, I was lucky & found suitable 14" disc brake ready rims at a local tyre fitting shop but I have no idea what vehicle they were off. They were just marked as Ford 14". The rims just touched the top of the caliper but a VERY small grind to the caliper fixed the problem. Rims fit perfect & I was able to have my existing tyres fitted to the new rims. Nice cost saver there!!
Had two pipes made for the new M/C & fitted a mechanical brake light switch to the pedal.
I can't take credit for any of this work. It was all done by my mechanic mate. He usually does Mustangs & has done many disc brake conversions on them but this was his first go with a Thunderbird.
An excellent job too!!!!
My thanks to all the members who have helped me with this conversion & given me priceless information that pointed me in the right direction.
I know there are many threads on this site re disc brake conversion & so many options & I hope that the info I have supplied here might be of assistance to other members.
Thanks again guys