I take it back - if it's a '63 block, it could be a 421/3spd/4bbl block. That was 22B. Then the 9770716 heads could be the original '63 421HO heads, either 353 or 370hp.
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Matt
1962 Grand Prix - Cameo Ivory|389 4sp|One-Owner Survivor
1964 GTO HT - Silvermist Grey|389 3x2s 4spd|A/C|Hurst Wheels|Frame-off|SOLD
1965 GTO Post - Mayfair Maize|421 3x2s TKO600|Pro-Touring|
1966 GTO HT - Barrier Blue|389 3x2s 4spd|Red Fenderliners
2005 GTO Coupe - Yellow Jacket|Magnacharged LS2 6sp|543hp/561tq|SOLD
2006 GTO Coupe - Spice Red|LS2 6sp|20k orig miles
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