the first thing i would do is check the bolt patterns of both the hood and hinges to see just how close [or far off] they may be.
if the width of the hood bolt holes matches the hinge bolt pattern, i would grab a buddy and bolt on the hood, then lower it [very] carefully, taking note of how it needs adjusting. it may be fairly close.
if so, you can see how much the hinge holes need slotted, which way [forward or backward], and proceed accordingly.
i'm thinking the hood bolts are 3/8", so you would want the slots to be 7/16 or 1/2" in diameter, or whatever the hinge bolt holes are.
it may turn out to be closer than you think it now is.
please let us know how it turns out. pics would be a plus.