I am building my first 383 also and have the same kit the 383 kit by eagle with forged crank and i am running a 2 bolt main block. I had some qeustions too when i put it together. I found that my rods hit my cam shaft and my machinist told me to grind my rods where it hit.. we couldnt see where it was too close to the block didnt have a problem with that.. i havent ran it yet still building it anyone have any suggestions??? thanks