I have a set of #94's with the larger valves installed and some ARP screw in studs. I CC'ed 2 or 3 of the chambers and they both measured right at 87cc's. You never know till you measure but the stock chamber size is supposed to be 90cc's. They should be around 8.6 to 1 if they are at 90cc's and you have a .030 over 400 with everything else relatively stock so milling them .040 would knock 8 cc's off of that and bring it to a little over 9 to 1. Just be sure and measure everything to be sure what compression you have. You would need to have the intake side of the head milled .040 as well to keep your intake fitting right.
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