I know this is a loaded question, but I am looking for opinions for the advance curve GM HEI Marine dist.. in a 468 BBC. It's not a go fast boat 38 ft. 15000 lbs. 468 round port 781 castings with a little bowl work and port matching , dual plane intake 10-1 compression hyd roller motor. I'm looking for big torque not really the HP . I'm thinking the advance should start around 850 900 rpms and be all in by 2800 with a max rpm on these engines around 5500 with a total around 32 to 34 degrees. Tell me what you think ideas etc. I realize it will take some tuning but looking for a good starting point. Thanks Jamie

The advance curve you have proposed should be fine.

with that much compression and iron heads, without 93 don't think you can run that much timing...total about 28-30 max, what would be great if you could run 34-36 up to about 3000 then pull back to 28-30...

I would go with about 20* of advance starting at 1000rpms and all in at 3000rpms. Set total to 32-34*. That is the same an HP500 curve.

BTW, 10:1 compression is way too high, especially for a very heavy boat like yours. It has very high risk of detonating even with 93 octane fuel.