As mentioned that is ton of cranking compression. I run a 247/251 @.050 sft on a 108ls installed at 105icl in my 410 with a true 10.5 static and I get 195 on the gauge. My brothers 360 has 10.8 static and was running a isky oval track cam that was 226/226 @.050 on a 107ls and installed on a 103icl and only bumped the gauge at 210-220.