I have a 3.4 I'm swapping into my Fiero. Eventually I plan on using a trueleo intake for it, but what heads flow better than stock heads while also allowing me to use the stock plenum? Are there any aluminum that will work. In heard the some of the camaro heads were aluminum but I'm not sure if all did.

Sorry you are stuck with iron heads if you want to use the fiero intake. Larry

Any intake that fits the iron heads will not fit the aluminum heads, and vice versa. They are completely different cylinder head designs.