My boss races and he had a engine built a 383 first lap out he broke the crank went and had another engine built and put these parts up he just gave em to me becuase he knows I want to build a stroker motor my problem is I dont know much about engines so can anyone tell me by the pics what these are he said it was to long ago to remember the exact. but the rods are crower,the pistons are good one but I dont know 30 40 it says SRP 40 on the inside of each, the heads have been machined with double springs and set up for roller twr 49008, the heads are GM the numbers are 3947041 then under that number it says L30 8 What cam should I buy and crank?

http://i170.photobucket.com/albums/u257/Domb1972/IMG_3991.jpg

http://i170.photobucket.com/albums/u257/Domb1972/IMG_3988.jpg
http://i170.photobucket.com/albums/u257/Domb1972/IMG_3990.jpg
http://i170.photobucket.com/albums/u257/Domb1972/IMG_3992.jpg

http://i170.photobucket.com/albums/u257/Domb1972/IMG_3993.jpg

Thanks