64 (Canadian) Valiant Signet (aka Dart GT) front disc brake conversion

These cars don't need power brakes IMO. I upgraded my wagon to factory Kelsey Hayes discs a couple years back, and it stops just fine with a manual master.

I got everything from the spindles out from a member on this site. And I used the parts list in the how-to article for everything else.

My Scamp has factory manual discs also, and I never had a problem stopping it either.

Both cars are heavier than yours.

You should try to find someone who has already done whatever conversion you decide to go with, and try your wheels on those brakes. Lots of those wheels were not designed to clear brake calipers, you could have major interference issues.