u/International-Pay685

Hello, I need some advice, I currently need to change the heads on my DE and I was wondering if at the same time I should invest in a engine rebuild kit since the engine would already be opened. Is it worth it? How much harder would it be to complete the job and what are some essentials and or tips you could give me if I were to do this job. Also what should I look for when changing the heads? And what common problems should I fix when its opened?

Looking for any type of help, thank you very much!