Wheel adapters... Good idea or bad.

[67Beaumont]

This is for a 67 Beaumont (Canadian Chevelle) It will be %90 street but it will see autocross a couple times a year and at least one full day of full road corse racing...

My car has very different back spaces front/rear. (Shortened 9" rearend)
I'm looking at wheels made for a Corvette more or less and they have a huge back space. (6.960 in.)

I would need about a 3 inch wheel adapter in the rear and a 3/4 in the front.
To run something like this...


Is this a bad idea.... I'm I going to be stuck with big $$$ custom offset wheels?