Call Competition Cams and ask them. They will tell you what you need to know.
Is this for an OHV V-6? You sure don't want much of a cam in one of those. Darn thing won't be able to pull itself out of it's own way at a stoplight if you do. Keep your lift high (beware of piston to valve clearance), your overlap down, and use a wide angle. No lope that way, but it will really help the torque...which is what will make the cam fun to drive. Again, call Comp and talk to them. Answer their questions honestly (don't exaggerate) They will make the best recommendation for you. Over camming an engine is the worst thing you can do for street use.
Curious...why would you need longer push rods? Does that cam have a smaller base circle?