i just finished building my 383 last week its back in the camaro now just need a few little things, should eb fired up for the weekend. I had to clrearance the block but very little some cylinders more than others. Its pretty easy to do. Like stated above theres how to on the board somwere shouldnt be to hard to find its 3-4 pages. Most kits come with cleared rods and such. My scat rods were already cleared. Dont be scared about it. Dive in only one way to learn. LOL