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Message: <blockquote data-quote="joemomma" data-source="post: 1499418" data-attributes="member: 25929">Yes the GT40/P are cast iron.  Those springs will support a pretty aggressive cam if you should decide to go that way.  Just something to think about here - you're looking at close to $1000 by the time you get those heads and have the new springs installed.  That's halfway to a set of really good aluminum heads.  Were it me, I'd hold out and save my pennies until I could afford a set of aluminum heads.  But again, it all depends on your budget and what you want to do with the car.  I'm in the same boat as you - my '94 has 158k on the stock engine and I'm ready for more power, and I'm flopping back and forth between just doing a top-end kit or going full on crate motor replacement.  The smart move (but also most expensive, meaning I'll be waiting longer) will be to wait until I can buy a crate motor.  But, the "I want it now" in me says just throw a top-end kit at it and run it now.</blockquote>