Good info. Volumetric efficiency is very important to make power. Usually your street rod motors are only in the 80s and maybe 90s if they got it hyped up. A good all out race engine can start in the upper 90s and go in the 110-115 range. Usually takes a pretty big cam 260+ @ .050 a lot of cr 12:1+, good flowing heads 280+ ect to achieve anything over 100. Who also has good info on this is Rehere Morrison Championship Engine Assembly.