If you are very conservative and worry that you could break something or crash because you have completely overloaded your first gen with horsepower when you add something like aluminum heads then consider this; Your first gen was built to handle 300 plus horsepower. Aluminum heads can be used to 'get you back' up to this number with the terrible fuel that is available today. So, you aren't being 'irresponsible' when you add these heads. You could look at it that you are putting things back the way they were supposed to be horsepower wise. Not recklessly endanagering your precious car and sending it to the scrapper in a basket.