If trying to run D D in the front and I have a 415 block and the stock 416 D block that I am using in the front rear. Does the 415 need to be flipped or any shims under it to be like if I had the 416 block?
Also currently I only have a1 1b and 1xb blocks to run in the back any suggestions on what I should use until the 1xa and 1E get here...