Don't spend the money on Clifford stuff, it is simply not worth it.
PST Suspension kit with new shocks. (I tell everyone this from Slant to Big Block)
Aluminum Radiator
1 Wire Alternator
Get the engine running and driving well, Super 6 is a nice upgrade
Rear End!!!
Disc Brake Conversion
Finally... start to play with internal of engine
I chased the slant six dream for a while. It can be fun and was a great learning opportunity for me. That being said, when I got older and had a bit more money it became un-enjoyable. For the $3000 I spent upgrading the slant it was still a 16 second car. I would get the car running great and plan a 360 magnum from MRL performance or something of that nature.