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Unsure how well the Grp n timing would work on the bp270’s tbh.
Regards what’s best, it all depends what you’re after. Peak bhp then 197, but in my opinion you get better drivability from Grp n on standard cams.
If you click on my link in my avatar, you can see 230bhp with a 197 head and inlet fitted to a 172 block. It may have also had some quite lairy items inside the engine as well 😂
I haven’t used this setup personally, but I just use the Karcher patio cleaner attachment turned upside down. I mix up BH autofoam in the bottle for the patio cleaner (karcher pw), as it has rust inhibitors in BH AF and send it under. I find it works really well tbh.