I'm currently breaking down my 318 to install Compcam XE268 with new chain and gears and a set of 302 heads. Car is 1964 Valiant 4spd with 3.91 rear. New timing gear for crank has notches for straight up, 4 degree advance, or 4 degree retard. Car is for 99% street use so should I just install it straight up, or not? Thanks Mike