Yep, that's a pretty big issue, and those vortec intakes are still pricey but they are getting to the used market now. The vortec heads can be drilled for the older intakes but I believe it doesn't match up as well as a new intake would(never seen a set drilled in person), there are some companies that sell them pre-drilled even so maybe it works out OK.
Thing is those open chamber (76cc) heads really are about the worst heads for efficiency or power. The older L98 corvette heads would be almost ideal too if you could find a set of those (and they are aluminum, if you like that sort of thing). Dart SR torquers would be another good choice, and still cheaper than Edelbrocks. Not that you'd be going wrong with Edelbrock stuff, it's really good stuff but If you're like me you have to watch the budget too.
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