I love Dusk over Dark Blue... I missed a project which was equipped very similarly a few years ago, someone on the boards here bought it.
If it was quartered correctly 40k is a fair price for a nice combo, I agree it was probably raced given the 4.88's and extra U bolts on the axle plates.
Biggest thing I see is about the interior is the reproduction door panels.
The Alternator is probably wrong, if the distributor and carb are right BONUS!