>> 2. What class would it fit into (I have looked at the IHRA site and can't find the info I need)
>> 3. How much would it have to weigh
Go to the NHRA Classification Guide at
http://www.nhra.com/tech_specs/class...ion/index.html and find the shipping weight of your car. ('80 Camaro, 2Dr Coupe = 3397) Take the shipping weight divided by your crate motor factored horsepower from
http://www.ihra.com/competition/crate_motors.html (305hp in your case). That (11.13) will give you the car's natural class. Look that up in the IHRA Rulebook and find the class... K/CM = 11.00 to 11.49. So, you can run J, K or L. Multiply bottom of the class factor times factored horsepower, plus 170lbs for driver.
J/CM = 3373
K/CM = 3525
L/CM = 3678
>> 4. What is the index for the class it fits into
http://www.ihra.com/statistics/records/index.html
Hope this helps. Welcome aboard!