[CanadianBacon]

Wondering if anyone knows the spline count and shaft size for a 1968 307. Unsure if there was different steering boxes for different engine sizes? I can pull it and measure but thought someone may know. My plans is to replace with a lower ratio steering box and need to order correct rag joint as well. Thanks for the help.

 

[Jynx]

Nah, won't be different based on engine size, it would be chassis/steering design related. They used a Borgeson Saginaw here in Australia not 100% sure about U.S but probably be the same. I often use Summit as their search & cross referencing is so good. Using Summit with your model info three Borgeson Saginaw units came up all using a 3/4" shaft with either a 30 or 36 tooth spline, so I guess you'll need to count.
Here's the search I used, you can drill down further to brands & parts types etc using the menu on the lhs.

 

[CanadianBacon]

Ok I try Summit, bought some stuff from them already.