Are you mounting the fuse block under the dash, behind the seat(s), under the seat bottom on the floor, or somewhere else? If you're using the under dash area I'd recommend that you pick your location with the dash in place with all of the instruments mounted to show you the true space available. I did mine with the dash out, and the layout looked very neat and organized, but having a line of relays up high in the dark was not a good choice for future maintenance. Ditto the in-line fuse holder that's in the Edelbrock harness to the EFI - very hard to get to, and would have been much better about 6" lower, or even more. Think about ease of access, and if you use one of the methods to make the fuse block removable from it's mounting spot (hinge, magnet, velcro) leave enough slack in the big wire bundle to let it move, and consider that the insulation will stiffen as it ages.