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A 302 or 270H head can make significant power, and with head work it can make some more -- but for a "mild street" engine in a full-size car your stock 270 head would likely serve you just as well or, perhaps, even better.
In the day, "California Bill" advised his readers to stick with the smaller ports for the 270 in a street-driven vehicle. He wrote that his customers were often disappointed in the low- and mid-range performance of a head with larger ports.
If you find a good 302 head at a good price, you might buy it and hold on. As we progress with projects of this kind, we often come to feel that "if some's good, more's better" and "mild" becomes more and more "wild." Those of us who start out with "wild" in mind are often disabused by experience. It is sometimes better to move forward in stages until we find satisfaction. Some of us only learn the hard way.
God's Peace to you.
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Inliner #1450
