Stock magnum max lift

Curious what's max lift for stock spring. Also what is a good cam choice for stock weight 70 dart. Will be running a 3.55 gear 255/60/15 tire . Custom stall to match cam. Will be a street car primarily but will definitely see the track. Found low mileage magnum only 33k miles and I just want to swap cam, put RPM intake and carb on it and have some fun.
.525 seems to be the number but you should always check.