9" drum to disc conversion confusion

Start this out simply I have a slant six 72 dart swinger that I reatored and drove a few years and now I want to go to a 318 small block so my first preperation is to swap to front disc from stock 9" drums.
I have a set of 78 aspen spindles and caliper mounts for a supposed 10" ? Rotor . My ? S are can I even use these spindles cause one site says yes and others say no, both mention differences in geometry. And I do not want to do anything less than proper. So should I just buy the whole kit for 400 that comes with a body spindles and 113/4 rotors. Or build off the b body spindles also the person I got them fronk said they will fit my stock a arms on my 72 but all other sources have stated otherwise