Standard bore 340 is a 71 block out of a Cuda Grandma drivin car with less than 20,000 factory miles speed equipment shop NE rebuild Trw forged flat tops steel 4 speed crank 340 rods all balanced , top are the 71 aajj heads Intakes are 2.08 stainless steel Mildon valves 1.65 on exhaust , Mild...