Small block bolt in cams ?

I just put a .470 lift howards cam with a 104 intake centerline and 110 lsa. I got lucky and found boss 302 mustang pushrods on ebay that were 7.625 inches and got them for $40 shipped from crane cams! Also im using the magnum heads so its actually .501 lift lol but anyway i have stock springs on the heads still and they have a ton of clearance between the coils so even once the lifters pump up i should still have plenty of clearance. Wouldnt go much above .500 lift though with stock springs. What im gettin at is check ebay for parts cause you can get really lucky. So id say duration of your cam is gonna be based on your compression ratio and lift will be based on what your heads flow and where.