Wireing my engine start-up stand

Was it me I'd use a fuse block with either screw terminals or spade connectors. Mount it to a flat plate and on the plate I would place a label for what each wire is. This way as age, oops! and changes take their toll on the wire they're easy to replace. I'd put all of the controls behind the bell-housing or in front of the radiator. Make access to the sides of the engine as easy as possible for running the valve lash, reading the plugs, header shape, etc.

I would suggest that you use an industrial Emergency Stop switch to turn the ignition and any electric fuel pump on and off. That way if something goes bad you can kill it easily.