Stock pan fits fine, Ill know more when the mounts are in this afternoon, but I have 5" of ground clearance. Im running the stock heads, which flow the same as the Z06 vette heads, just larger chambers. Im using the Edelbrock 2216 cam , edelbrock 800 carb, ls6 springs. If you buy a truck 6.0 with the HD 4l80 trans it already has the spacer and correct flywheel.