POS, I've seen your username out there relative to this issue. If i can clear the firewall, i would rather use the standard HEI cap design for simplicity. i am doing a mock-up measurement tonight to see if the cap will clear. i am setting an HEI cap down over the stock distributor with spacers on each side to center it as best i can. i have about an inch and half from the current cap to the firewall now and i will need about 1 inch additional space to the rear. thanks for info. JP in the land of Oz.