Any drawback to keeping the drum spindles on my 66 Valiant?

Super Sleeper said
I will definitely be upgrading my front 10" drum brakes to disk in the future. It seems to me like the options for disk brake conversion seem to fall either into changing out the spindles to later model disk brake spindles or keeping the drum brake spindles with a conversion bracket to the caliper (Leed or Wilwood). BTW, I do plan to go with 4.5" bolt circle and 15" rims when I do the conversion.

Thanks - Jim

When I did my conversion (15 + years ago ) to Disk Brakes ... the SSBC kit "required" the 10 inch spindles !!!! And the SSBC Rotors have Both Bolt patterns for the wheels... 5 on 4 & 5 on 4.5... and came with Both sets of wheel Studs ( 7/16 & 1/2 )
Since my 65 'cuda was a Formula S, it already had the 10 inch spindles... I did the install and have been totally happy with the SSBC disks... and NEVER a problem all these years !!!