heres m 5 cents i had the opportunity to drive and tune the caddy eldorado my 500 came out of before i put it in my t bucket. the timing was very sensitive in the caddy. one could not just bump it ahead a little bit and expect for it not to ping cause as soon as i did that it pinged under acceleration.
put the same motor in a 2500 lb car with 3.55 gears and 32 inch tires no ping i have about 10 deg timing in it and it runs good i also have installed a dist spring kit to open the weights up quicker and it seems to be fine with it, i can advance the dist to the point the car wont turn over after being shut off and it still wont ping . part of this may be the engine heat factor but i still think the removal of 2000 lbs of steel definitly helps

what abut elevation and comp ratio,,how do those 2 interact?
anyone out there ?