273/ 2 barrel camshaft options

I agree the E4 cam is a good choice for an off the shelf cam. I wouldn't go any higher than low 4's in lift because as mentioned, you can overcam that engine easily since you seem to be trying to keep it fairly stock. I'm a solid cam guy for my toys, so, I personally would keep that. If you can get those lifters refaced without losing any hardening, I would probably do that too unless you can find some quality new lifters out there. Maybe contact Esky for their opinion? Don't get carried away with heavy springs on a street car. You'll still want some good zinc oil regardless to keep the lobes happy. If you never done it, have your machine shop install and degree the cam along with a good quality double roller timing set.