I just solved the same problem with my '96 LT4 coupe. I used 2x12 material to build a two step ramp for each front wheel (17 inches long with two thicknesses at the end) which gains 3.4". Your coupe's front clearance is 4.2" so on the ramps, you'll have about 7.5". That's enough for a Craftsman 3-ton floor jack with the jacking pad removed and a 2X6X15" board in place of the pad. Slide the jack up under the center of the engine cradle and the car will jack right up quite easily. Stay off the a-arms. For the rear, I use the same jack with a jacking adapter from Corvette Gadget Man in Canada. This allows you to jack directly from the center of the car on the differentail. I'm not willing to jack any corvette from the side or the jacking points for fear of breaking a windshield or a glass top. Jacking from the center is by far the easiest and safest way. Always use jackstands of course.