You can remove weight for only the cost of your time and run quicker.
What intake are you running?
If you order the heads with a good bump in CR then you will gain there.
You can buy lighter rims and gain there plus you have cool looking rims.
Everything is relative. One thing is certain. Sinking money into iron heads will bring nothing back on the resale value, in fact could hurt depending on the heads. However buying a set of aluminum heads will have more resale value.
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68 Firebird
Are you running with the wind or breaking it?
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