The best and most official site I've found is FoMoCo.com. Go to "Tech. Dept." on left menu. Then click on "Engine Specs" or something like that. Then in the drop down menu, 351-4VC was first built in 1970.
Or go to classicponycars.com like 69fastback said, go to "Engine Specs" then go down to 1969. There is no Cleveland listed. Just the Windsor.
Plus anyone who I have ever talked to has told me the same. No Cleveland in 1969. They are found in them quite often, but not 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