9.8-1 is doable. I had a 360 with a zero deck piston (KB-107's) and J heads. The cams were a bit healthy. Smallest being a 292 purple cam. Not exactly small in duration.
If your cam is not going to be above 236 @ 050, use the lower compression figures.
Figure 1 point of compression is about 3% more (or less if lower) power in a street build of fair stoutness. I would rather run a lower ratio and be down on power (Big whoop! 3% down) than run something to high and have pump gas issues and have to retard the timing to get it to run.....
