20" fitment on 70 chevelle

[ness01]

I am looking to purchase a new wheel tire setup for a 70 chevelle. here are the specs...

Rear: 20" x 10" - With tire (305/35/20), the overall diameter/height is going to be about 28.4"

Front: 20" x 8.5" - With tire (245/40/20), the overall diameter/height is going to be about 27.7"

Can anyone tell me if can tell right away if this fitment will actually fit a 70 chevelle with stock suspension settings? spacers?

Thanks