can I suggest a GM part number 12499101? This is a BRAND NEW 383 engine assembly that includes fast burn heads, an intake, cam....the entire enchilada. It sells for about $4100 from your friendly Chebby dealer or from Scoggin-Dickey or from Sallee Chevrolet. The thing is 340 hp and 435 ft lbs of torque with 9.1 to 1 compression. This is an excellent street engine for your truck (and for my jeep or truck for that matter). It has a warranty from GM

mike in tucson