The 5A heads were used on the 307, so I think you got hosed. In the future, check the FAQ at 442.com for casting numbers first:
http://www.442.com/oldsfaq/oldsfaq.htm
By the way, what's "...a big bore quad carb 2 barrel..."?
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Joe Padavano
64 Jetstar 88 Conv
66 442 L-69 Conv
68 W-30
69 H/O
69 442
70 W-30
72 442
84 Custom Cruiser
86 Caprice wagon (w/307 Olds)
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