There is now way to tell what static compression ratio you have with a compression tester. You need to pull a head and measure some stuff. MUllin, you will want to keep the cam coice mild until you do some digging. You cant run stock springs with a lot of cams. Even the milder ones I install. They get matching springs. That 484 is so wrong for your car, you need to stop reading magazines, and start reading tech books. YOu said in another post the car tried to come around on you when you drove it recently..Too big a cam will give the sound you want, but you wont need to worry about it ever coming around unless it's raining. The less you knwo about your exact engine, the less likely any choice will give you what you want. And the more likely a change will hurt you.