That's not the original 261 in there I don't think. Green valve cover is certainly off the original engine but the Chevy orange block makes me think 235 replacement engine.
Looks like a solid car though, love the old school roof racks!
My Dad had those roof racks on his '65 Belair ... Crappy Tire specials!
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Prince Edward Island
'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.