Alloy heads don't intrinsically make more power, you can get good quality heads in iron castings, such as the Dart Iron Eagle range. The benefit is that they are lighter and that they disipate heat better. Aluminium heads, new, are the same price as iron heads, so it is a no-brainer, unless you have a good set of iron heads.
IMO, Old chev castings are basically rubbish, and should only ever be used on mild engines in near standard form. You can make a set of double hump fuelies flow, but it will cost just as much in porting as it will to buy a decent cc good quality cast that can be used straight out of the box.
IMO, Old chev castings are basically rubbish, and should only ever be used on mild engines in near standard form. You can make a set of double hump fuelies flow, but it will cost just as much in porting as it will to buy a decent cc good quality cast that can be used straight out of the box.

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