slant daily driver buildup

Wow your really glutten. The 73 trans wont bolt up to your drive shaft. You have a trunion mount on there now (if its still factory). That will have to be changed the drive shaft may need changed. Then you have to swap out the steering column (your 73 is most likely a column shift).
Now for the engine. You REALLY need the OS valves they are cheap and allow the slant to breath. If you are going to spend the money on the slant then lets get it running great instead of good. As for cam I like the 280/270 Erson RDP grind for a DD or SS/DD.
Just my 02.
Frank