Pacer Spindles for Racers?

Ya that's what I'm wanting to order as well. I have a rack I'm considering on my 71 Javelin. Let us know if they fit please! 

YES. All AMC spindles (the part that holds the bearings and hub, anyway, are the SAME from at least 1950 on. The lone exception is the 1975-78 front discs, which used a larger bearing spindle. Even those spindles interchange with others -- the four hole bolt pattern is the same.

The only difference in the spindles (with the one exception) is the thickness of the base. Drum bases are typically thinner than disc bases (except for the 66-70 four piston Bendix brakes, they used drum spindles, IIRC). There are 2-3 thicknesses of drum brakes. V-8 brakes were usually wider than six, and some have thicker bases to allow the drums to clear the steering knuckle (the upright)... but not all. Easy enough to use longer bolts and spacers (grade 8 washers.. they won't crush) with drum spindles, disc spindles may have to be machined thinner depending on what brakes you want to use. Most people don't have that problem, few go from discs to drum!

In general anything but the 79-83 small  car rotors are expensive because they are unique to AMC. The 79-83 rotors are getting harder to find and higher in price also. You can still get Centric and Raybestos brand (probably same manufacturer) for just under $30 from RockAuto. Wagner and Bendix brands are over $50. Honestly, I was surprised to see the <$30 rotors at all, last time I bought one from a local store it was around $40, and that was 8-10 years ago. Probably a Wagner or Bendix though.  This is the main reason I always recommend the Scarebird kit if replacing drums for a driver. Cheaper, easier to find parts for the next 20-30 years as the original style AMC parts continue to get scarce and expensive.

Calipers are cheap because they are the same, regardless of year, as many other makes used. Just the caliper mounts are AMC unique, and maybe hoses, though you can use generic/other make hoses as long as the ends and lengths are close. The old Bendix four piston calipers are a little pricey, but there is a Chinese made new part available now that is a bit cheaper. Couldn't find pricing, but they have been reported in the $50-100 range. The old Bendix design has the seal on the piston, so the body wears. Newer calipers all have the seal in the body so that the easy to replace piston wears.

I already purchased the rotors so I might as well use them. Thanks though! 

My concern was more with the steering arms. On paper the 5 3/8" steering arm centre to centre works.... With a rack with a total of 6 inches throw. Ends up at around 30 degrees steering which is further than the stops on a '64 classic at least. I can't confirm with a upper ball joint front end because I don't have one here with me to measure the offset. But evidence from several threads on here convinced me to purchase. I will confirm and show my working out later.