the brown wire/blue wire end of the ballast is the downstream end as the brown wire is the ign2 (cranking) circuit which bypasses the ballast as the fire goes from the brown wire to the blue wire right there at that connection on the downstream end of the ballast & onward in the blue wire to the coil. in ign1 (run) the brown wire is not energized from the ign sw but instead the blue wire on the other (upstream) end is hot & the current must pass thru the ballast & is reduced then it goes on to the coil from the blue wire at the priorly mentioned brown/blue wire connection on the downstream end of the ballast. since the blue/brown wires are connected at that end the brown wire is hot in ign1 (run) but it goes back to the ign sw & dead ends there so it is of no consequence when running as opposed to "cranking". (just threw that in to help you grasp it). I would suggest ALL of the prep items & keep it going for 25 minutes unless there is a leak etc. You need helpers! You have one shot to get a good breakin on the cam and to get a good ring seal for good leakdown numbers/minimal oil consumption. Another item I forgot is jack up the front end a reasonable distance as this helps with purging air pockets plus helps your helpers spot/ID exact location leaks underneath