L31 short block with 64cc aluminum heads is supposed to be 9.4-1 compression.
Hydraulic roller cam with 224 intake,230 exhaust duration @ .050 with 110 lobe separation.
I was wondering if the dynamic compression ratio was going to be to low on this motor to perform well, if so I will go down a notch on the cam selection.

Also....I want to be able to run 87 octane.

intake centerline-106

valve timing @ .006 lift 64 degrees ABDC

Compression calculators here. >> http://www.kb-silvolite.com/calc.php

That cam is perfect, don't look to change anything...except maybe put some thinner gaskets on it IF you don't already have the heads on...

Thanks man.... the 9.4:1 is going to have to stick though. I dont think I can do much better anyway because that is with the GM .028 gasket. My gas is pretty bad around here anyway.

I have also been toying around with the idea of going with 112 lobe separation instead of 110 to spread the power band out a bit and make it idle a little better.
do you guys have an opinion ?

I think it will run just fine. Still I would try to tune it for the best gas that you have. 91 octane should give you a little boost.