340 A body versus 383 B body

Even at moderate to serious level effort in FAST, the “340” 420 CI A body (10.48) NOT 3600 lbs is quicker than the “383” 499 CI B body(11.0)at 3600 lbs It is just HARD to overcome the weight. The B body will close that up a bit, but the A isn’t sitting still. Take the 499 CI “383” and put it in my 3150 lb (with the b block) fastback……..and the b bodies are a distant memory, but I would still probably be battling a small block A body.