That is exactly the reason why I went with the SSBC kit that uses the original drum spindles. There was a recall on the repop spindles a couple/few years back that affected a lot of the kits. I have zero confidence in those parts now. You can search the forum for posts about the recall.
Ok, to summarize all this....
Keeping drum spindles and running manual brakes. Keeping 15" Magnums.
I've eliminated the kits that are over $800.00 since there are more than one that cost considerably less (cheapest price I've found for each shown):
Wilwood Dyna-Lite Pro Series kit, which does not include hoses or master cylinder;
11" rotors, 4 piston calipers:
$688 on Summit.
SSBC #SSB-A156 kit, INCLUDES hoses and master cylinder; 4 piston calipers,
11.25" rotors:
$686 on Summit.
Scarebird: Their "medium duty" brackets use a
10.5" Lincoln rear rotor and a 1990 Chevy Celebrity caliper. I figure by the time I get all the parts rounded up, it'll be about
$525.00
(Note: The SSBC A154-5 kit someone is selling right now on here is actually for C-Body from '63-'64!!)
Leed: A nice complete kit including master cylinder, flex lines and hard lines at MC, proportioning valve, 11.33" rotors and 4 piston calipers that look suspiciously like the SSBC ones.
$840, so over the budget number.
This is about all I'm coming up with, short of finding the proverbial 1976 a-body in a junkyard somewhere.