Hardened Valve Seats or Not?

Built my 340 25 years ago and have not been able to finish build until now. Problem is that back then I had heads rebuilt but failed to have hardened valve seats installed. Now I am going to finish car and need to decide if hardened seats are important enough to pull heads off and have done.

I plan to drive car around town, to local and distant shows. I don't plan to push the car too hard, but will punch it from time to time.

Should I do the hardened seats, use a lead additive with unleaded fuel or are there other options to consider?

Thanks for your thoughts.......