[1.12.2] Specifying block rotation while placing

Hi, I have the code: 

private static void placeBlock(final BlockPos pos, final boolean spoofRotation) {
        if (!this.mc.world.getBlockState(pos).getMaterial().isReplaceable()) {
            Command.sendChatMessage("BLOCK WAS UNABLE TO BE PLACED :(");
            return;
        }
        for (final EnumFacing side : EnumFacing.values()) {
            final BlockPos neighbor = pos.offset(side);
            final EnumFacing side2 = side.getOpposite();
            if (this.mc.world.getBlockState(neighbor).getBlock().canCollideCheck(this.mc.world.getBlockState(neighbor), false)) {
                final Vec3d hitVec = new Vec3d((Vec3i)neighbor).add(0.5, 0.5, 0.5).add(new Vec3d(side2.getDirectionVec()).scale(0.5));
                if (spoofRotation) {
                    final Vec3d eyesPos = new Vec3d(this.mc.player.posX, this.mc.player.posY + this.mc.player.getEyeHeight(), this.mc.player.posZ);
                    final double diffX = hitVec.x - eyesPos.x;
                    final double diffY = hitVec.y - eyesPos.y;
                    final double diffZ = hitVec.z - eyesPos.z;
                    final double diffXZ = Math.sqrt(diffX * diffX + diffZ * diffZ);
                    final float yaw = (float)Math.toDegrees(Math.atan2(diffZ, diffX)) - 90.0f;
                    final float pitch = (float)(-Math.toDegrees(Math.atan2(diffY, diffXZ)));
                    this.mc.player.connection.sendPacket((Packet)new CPacketPlayer.Rotation(this.mc.player.rotationYaw + MathHelper.wrapDegrees(yaw - this.mc.player.rotationYaw), this.mc.player.rotationPitch + MathHelper.wrapDegrees(pitch - this.mc.player.rotationPitch), this.mc.player.onGround));
                }
                this.mc.playerController.processRightClickBlock(this.mc.player, this.mc.world, neighbor, side2, hitVec, EnumHand.MAIN_HAND);
                this.mc.player.swingArm(EnumHand.MAIN_HAND);
                this.mc.rightClickDelayTimer = 4;
                return;
            }
        }
    }

however upon placing a block such as a dispenser, its orientation seems random. I was wondering if there was a way to Specify which way it should be facing (north, west etc)

Ive searched around and have no idea where to start,

thanks