What about camaro vs. nova? Are they the same? My dad's camaro has nova arms on it, so if they're different I would suspect bumpsteer might be a problem. I haven't driven it since the disc-swap, so I don't know if it's OK or not.
The "69 nova" spindles I bought at a swap-meet have different arms than dad's '68 drum spindles had. Maybe I got lucky and the ones I bought are actually for a Chevelle