Small bolt front disc options for a 65 Valiant ?

best bang for the buck would be the scarebird setup
they have them for both the 9 inch and the 10 inch brakes, but i dont know if there is a difference in calipers and rotors between the two

if you just piece it together (buy the brackets from them, and all the other parts from rock auto or so) it could be as little as 200 dollars

According to my instruction sheet for my scarebird setup you just flip the plates from the rear facing way to the front facing direction for either 9 or 10" spindles. using the same rotors and calipers+ hoses. rotors are already 5 on 4.5 so you need to use the template to go to 5 on 4" pattern using slightly longer studs +1/2"

I have used these on about 6 SBP cars and converted others (including mine) over to LBP so I don't have to drill the rotors of I need to replace them. They stop great and have not given me any problems on the daily driver I use when I go to Michigan about 6k per visit and over 30k on this set of brake pads so far.