Do you have access to any boards that you can drive up on?
Like 2x4's or 2x6's. Enough to get you the clearance you need to use the jack effectively? You may have to sort of stack them in a ramp type fashion in order to accomplish this though.
The reason I ask is because, the ramps you buy (unless you get low profile ramps)? may be too steep
for the front of your Vette to clear.
~Ray