318 build
How much bigger valve can you use before you have to worry about shrouding the valve by the chamber walls or the bore itself?
According to Darin Morgan about .200"+ valve to wall clearance the bore doesn't shroud flow, but doesn't mean there's not a net benefit to larger valves even if there's shrounding.
360 heads can fit on a 273 bore a 318 is .285" bigger so on the intake valve side of the bore you would have .143" plus whatever clearance the 273 had, a 340 would have another 0.065"
of clearance with a 1.88" valve but basically the same with a 2.02".
Don't most street cars operate in the 1800-4500 rpm range for the most part?
Normal for part throttle driving, performance street car is a balance between many driving circumstances but if the OP decides to hurt one for the other it's up to them.
And just cause you favor decision for full throttle doesn't mean your overly gonna hurt part throttle especially on this build level of engine.
Generally larger cams are less streetable than bigger ports for X amount of hp.
Would big valve's and ports really be necessary for a daily driver where the person is only looking for a boost in performance and not needing tons of power
A V8 ain't necessary at all for daily driving. If you want to putt around town is what the /6 was designed for 170/198, even the 225 was designed as a upgrade in performance over base. And since you don't drive a /6 at full throttle all the time even they have extra power for daily driving.