Just FYI, if you think you’re going to use those wilwoods with your current SBP rims you’re probably mistaken. The hub diameter on the wilwood kits now is gigantic. They redesigned their hubs a couple years back and increased the hub diameter. They won’t work with any of the original SBP drum brake wheels.
Also, regardless of the kit you use, make sure its for the right drum brake spindle. There are two different 10” drum spindles, the ‘73+ drum spindles have a different inner diameter and use different wheel bearings. The 73+ spindles also use the larger upper ball joint, so if you wanted to upgrade to the 73+ BBP disks you wouldn’t need to change your UCA’s, you already have the large ball joint uppers.
The SBP brakes are a waste of time IMHO. Lots of money to keep a bolt pattern with almost no rim selection. And limited parts availability for the rear drum brakes too, it’s “ok” now but there have been years where you couldn’t get anything other than NOS rear drums. And if you go wilwood there’s a good chance you’ll need new rims anyway, so you might as well bite the bullet and upgrade to BBP and have better brakes all around.
