If it's a dedicated racecar the solid rotors are fine
by any of the number of suppliers Baer or Willwood or many of the aftermarket stuff
Right Stuff, Summit Racing, Dr. Diff

or Mancini Racing house brand
some make a drum to disc conversion using the factory drum spindle
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if it will be driven on the street still, at all regularly
I'd go with SSBC (Stainless Steel Brake Company) offerings are great
their or any of the names above in a 'vented rotors',
the 'solid thin light rotors' will heat up instantly, serious brake fade on reg. driving
some of the street/strip type kits with vented rotors, are a lil' pricey
but are usually quality products
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And if it going to be manual brakes, not power assist, like most racecars
the size of the Master Cylinder bore makes a huge difference
15/16" is about the biggest diam. bore to not have
to use excessive brake pressure on your foot/brake peddle
use good Teflon lined brake lines too, not full rubber