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Putting a thicker head gasket on is a bad idea in my opinion. Adding a little more cam will help, but I see no issue with using the stock cam.
Using less cam is a waste of time.
Tom
As stated above, the rated comp ratios were often a 1/2-1 point higher than actual. 9-9.5 should run okay on 91, 93 would be better.
Since stock 69 heads have no quench anyway, a thicker head gasket is an easy solution if you do have detonation problems.
This story doesn't end just yet. Too busy working to mess with that cherry picker right now.
I'm working on converting my radiant tube heater to propane from NG plus I'm playing with installing one of those ChiCom diesel heaters in the cold side of my shop just to take some chill out of the...
Most engines have less compression then what the factory rated them. You won't know exactly unless you measure. If it still has the factory piston it will be in the mid 9's give or take using a typical .039 thick head gasket. Factory used a thinner steel head gasket and will be a little more if...
An all stock 69 440 should perform good on premium pump gas. If you get any detonation you can bump the octane up a little with an octane booster or lower your timing by a degree or two. I choose to keep stock timing and eliminate any thoughts of detonation with an octane booster, or mixing some...
Selling the current engine in my Hemicuda in order to replace it with the original engine. This is a good running engine and is offered intake to pan - less accessories.  buyer is welcome to come inspect as running engine and deposit necessary for removal. Exact timeframe can be discussed...