Converting to all toggle switches??
That was my other question. Will each of these toggles need a relay in between the switch and the component it's connected to?
You can do it any way you want (if you insist) if you use large enough wire. What you do NOT want to do, as I already said, is chop up a factory harness and depend on the bulkhead connector. Do a search on here for that, or look for "MAD electrical" on Google.
The thing that say, an underhood relay box gets you is that heavy loads, pumps, fans, headlights and even ignition, don't have to go into and out of the bulkhead. You can simply control relays, which lightens the load on the bulkhead "through" harness, as well as shortening current path.
I'm not trying to insult you, here, but from the questions you are asking, you may not be ready for something like this, without some local talent.
A "drag only" car with no accessories can be as easy as ignition and start. Two huge wires and a great big heavy duty toggle and start button.
