Use a cam like Ta performance RV212. I used one of those on a stock 350 with 2 bb and it pulled like crazy off of idle.
my 1970 350-2 has some unknown cam that isn't stock. It pulls like how Sean decribes @ WOT .. Gota be close to 400ft lbs since the stock rating was 350 ftlbs at 2800 RPM.. Not sure exactly how much but it sure pulls alot harder than some of the modern muscle. Just way heavier..