98 RON is about equal to 93-94 in the US, so I'd stick with 9.5-1 or so CR. I have seen higher run on that gas, but I like to make errors on the caution side.

If i am undersrtood right, the dynamic compression ratio should be arround 8.0 or bit more.

you can go 10/10.5-1 compression.I ran 10.3-1 for years on iron heads and 93 octane.

In very general terms, yes. Big difference between Dynamic and static CR.

Just bought Summit brand 308cc rec-port heads. Used under 20 hours. could be same as Dart iron eagle 308cc

summit brand cast iron BBC is from Dart,

the 308's need 4 different cam lobes.

very good choice,one million times better than the peanut port gm head.

You just made your goal a million times easier to reach.

This intake came with the heads. Cant find any casting numbers.

Not sure if it's ok to post this
but if any problems with your big block?I have 2 new 454 HO rectangular port one with new intake & stainless marine exaust!Sorry for the hi jack!