You have more than just one problem--the engine overheated. It's made of aluminum and when you go back with the head bolts, you may very well pull the threads out of the block. If that happens your going to need timeserts to make the repair. For all the work your doing, I would be looking for a used engine, like a 530 engine and bolt that back and enjoy 40 extra HP. By the time you do all the work with the head and all
you will have about the same money invested. If you go the 530 route, use the intake and the throttlebody and all from the 525. Thats all there will be to it and you'll enjoy better pick up and gas mileage.