10-11 second combos with hp weight gear ratio

A friend of mines. 68 340 4 speed dart Been bored 40. over.The heads have had lots of work. Put in 202 vavles its got a really big cam in it the biggest cam you can put in a 340 aluminum intake weind.balanced 580-600 mechanical cam Slight port and polish on the heads on the intake side and some on the exhaust bigger springs and better retainers and new pushrods too horsepower 450-470 11.2-11.5 1/4