I found the best way to get the hood where you wanted is a simple initial install. Then measure how far you need to move the hood (back and down) to fit properly against the cowl. Then, remove the hood, mark the hinge location with tape and move the hinges the appropriate amount in both directions (both sides. Refit the hood and presto, hood fits nicely. Might have to repeat once or twice. Make sure the hood supports are installed before measuring. This method takes the affect of the hood supports out of the equation.

Shimming up the radiator/core support simple closes the gap between center of hood and cowl.