If you really want to keep the 326 block and still want aluminum heads get in contact with Ken Brewer at Pacific Performance Racing.
He is about to start offering a new head made for the 350 engine with valves that better fit the small-bore Pontiac engines. Good luck with your engine. 
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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