I index the bonnet hinges on all Sprites.
Bolt it up, make sure the lines and fitment are to your liking.
Now drill 2 small holes through each hing, insert a small roll pin in each hole.
After you remove the bonnet the first time, enlarge the holes in the hinges, not the bonnet by the next size drill bit.
Now when you replace the bonnet it will slip over the roll pins and be perfectly aligned.
When I say roll pin, I use a pin that is smaller than 1/8", nobody will ever know you have them there unless you tell them.