Yes and no, to the valve springs issue. Dunno why you brought up rods though
See this whole thread is on best stock camshaft combo for the s14... Wether it be the standard 232/232 s14 cams, or dropping in a set of stock s13 240/248 cams, or using the nissan motorsports cam / low budget cam (non pinned) which is 248/248 (two stock s13 exhaust cams one either rotated or pinned to work as an intake cam), or a mix of these like the 248/232 (like im running) or a 248/240 (I may try), it doesnt matter. They are all stock cams so they just drop in, needing at most a reshim.
Now the issue with the valve springs is with large lift cams. With the larger lift there is more downward movement on the valves (of course) thus can bottom out, so to say, the springs themselves and cause them to buckle.... Not really a good thing

but if you are using that large of a cam it wont be to streetable anyway and would usually only go on a race prepped engine where the valve train would be upped anyway to allow for a slightly higher rev.
This is from what I remember so if Im wrong somewhere, someone feel free to chime in.