EQ heads on LA 318 question

Stock magnum springs are 85#@1.6 OD is 1.320". They coil bind at .480" so we dont recommend more than about .460" lift. Our stage II springs are 120#@1.660 and will handle .550+" lift OD 1.420" which is probably larger than the 340's but I dont have any 340's to measure here.
OP, did the place you got heads from offer you any advise on all these parts?
I would also not recommend reusing old valves as you can damage new guides installing old valves and most of the heads we take apart have worn valve stems. You can reuse the rockers if they are good. Head bolts are supposed to be changed out each time but nobody does. To me, its not worth $35 to clean old ones up.