If there are 6 valve cover bolts, those are Windsor heads. Clevelands have 8. I bet it is a 351W-4v that was in it originally.
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Previously "BennyBoy"
'69 Coupe with 351W-I rolled it 8/8
Edelbrock RPM intake, Edelbrock RPM cam, Edelbrock 750 cfm carb, Hedman headers, 2 1/2" pipe, glasspacks, C4: shift kit, 9" Currie: Trac-Lok 3.70s, 290hp-stock heads
Starting Project "2ND COMING": 1969 Fastback