GT40 heads have weak decks. I have warped a few sets. They are a great bang for the buck if you keep the power level low! If you plan on making big power in the future put arp head studs and MLS gaskets in now. If you plan on driving NA there is nothing wrong with GT40 heads, head bolts, and felpro gaskets. My first boosted setup was a stock cobra engine with gt40 iron heads. The gt40 parts hold their value well so even if you buy them you can re sell on ebay easily if you upgrade later. Removing the heads is easy just use a PULLEY PULLER ON THE POWER STEERING PUMP PULLEY, otherwise you will find out that they don't make replacements lol. Clean the deck surface veryyyyy well use copper spray on the gaskets if using head bolts you better clean the threads out several times.