That's about right When I had mine built 16 years ago it cost around 100 dollars . I used the link I supplied here for Biltron . It's still in service now in my friends car with a 73 slant in a 65 Barracuda with the 2 cable trans
Actually, all you needed to do was put an adapter ring in the end of the crank (I sell those) and use the stock 65 trans, and converter. That is a easy conversion. The hard conversion is a late (68 up) trans, behind a early (67 down) slant six or 273 engine. That is where you need the special converter.
