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Steel heads = 9.5, aluminum heads = 10.5. Thats rule of thumb, as cam choice can have a big effect. Good rule for street cam / operation though.
I would also factor in quench distance as well. Im running over 11 to 1 in my 360 with aluminum heads and pump gas. Granted I am running the MP509 cam (unfortunately), and that is probably bleeding off a lot of it. As Im sure you know, with todays head and piston designs, along with modern cam profiles, the old rule of compression ratio limits on the street should go out the window
1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)
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