They are perfect for replacing LS with older stuff. Move the motor back about 1 inch to properly align the original gear. They come with "spacer" washers to avoid heating them up and having to poke a hole in the back of the original SBC mounts, but they seem to fit better without them. I usually smooth out the cutouts and shorten the studs. We have used them to install 5.3s and 6.0s on 88, 89, 98 and 1999 Chevrolet OBS Trucks and to replace a 2000 Express Van.
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