Not at all and sorry for being late, it's not a problem, but theoretically and according to a guide posted here, the direction of the airflow ideally should be with the following directions, from front to rear and from bottom to top, the first direction is justified as the rear of the case usually is facing the wall behind the case so it's better to pull fresh cool air from the front, and the second direction is reasonable since hot air tends to go up as it's lighter (less dense) so the ideal setup for an intake fan is two locations, front and bottom and ideal setup for an exhaust fan also two locations bottom and rear.
For the Evo you have as it's a single tower cooler so actually it will not matter that much whether you pull air from it's fins or push air and actually it will have to come to your trials you can set the fan in a way like pull and records the result then switch it to push and see the results, but in any case you should go the flow
, I mean set the CPU fan to aid the general air flow setup inside the case and not to be against it, for your case if the fans are facing upwards you can put it in front of the fins to pull air from the cooler or behind the fins to push air into it, either way the direction of the air will be from bottom to top as the general ideal direction of the air flow inside the case, if you switched the orientation of the heat-sink so that the CPU fan faces the rear exhaust fan, you can put it either way in front or behind the fins but make sure that the direction of airflow is from front to rear that way both front and rear fans will help in the process.
In your case there is an option of side-mounted fans, usually at the removable door of the case where there should be a windows in most new models, in this case most of the time the fans are set as intake fans to help cool the GPU as well by pushing cool air directly on the GPU, also it helps with the CPU cooling down the fins of the CPU cooler, but remember all in all, you have to balance the amount of exhaust and intake as possible since it will result in different types of different case pressures, negative, positive and neutral, I can explain the difference if you like but then the reply will be too long