After yanking off the old wires, we loosely installed the new ones on the plugs. MSD’s Heli-Core universal wire sets come with the spark plug terminal and boot installed on an extra long piece of wire so you can plan routing to the distributor to your heart’s content. We planned to loom the back three wires together with MSD wire separators, so pre-fitting them together allowed us to determine the correct length. MSD’s straight plug boots can be bent to a slight angle. They bend easier one way than the other, so lightly push and pull the terminal to find the easier direction and tweak it to the right angle-of-the-dangle for your application. They won’t go to 90 degrees, so buy fixed 90-degree plug boots if that’s what you need.