An alignment head for an automatic fastener feed installation tool employs a platform with spring biased retractable pins and a central opening. The retractable pins are spaced to protrude downwardly and engage opposing sides of a support joist. The central opening receives the fastener which is automatically positioned for driving at an entry position into a deck board overlying the joist. The fastener is drivable into the joist at a medial position of the joist and a pre-established position from the edge of a deckboard. The pins also define the spacing of the adjacent deck board. In one embodiment, the alignment head is employed for securing the deck boards at a consistent 45° angle to the joist.