It's a glow engine, not a nitro engine. That off my chest , there is no chart other than rough numbers as provided already. Timing is influenced enough by prop load, plug choice, atmospheric conditions to make blanket statements next to impossible. Quantitative readings or charts are useless except to get you in the ballpark, but the fact that it is a commercial sport engine means you are much closer to the ballpark already than you would get with someone else's numbers. You can only compare compression readings with the same engine that way, and then that assumes you have good control over the minute variables. With modern tapered bore engines - ABC/ABN/MTV, whatever - forget it, ground based compression readings tell you nothing and likely do more than cause unneeded wear.

5-10% will be fine with that engine, based on the era and the fact that it is a sport engine, and I would not recommend running 100% synthetic oil either. Don't overprop it to start, I'd say bench run it on an 11-7 or so and find out how it behaves, and make changes to fuel or compression ratio if a need is apparent.

MJD