The bolt pattern matches SBC Brodix head spread ports. Here’s a picture I saw online. Looks like yours may be for 2-1/8” primaries.
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Tom
1963 Lemans -428 +.030, SD Perf KRE heads, turbo 350, 9" Ford 3:90, 11.01@121
1956 Chieftain gasser, 461 stroked 400, SD Perf ported E-heads, turbo 400, Dana 3:70 10.40@125
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