340 HP in 62 Small block? I do think Chevy was full of poop! Did they Dyno it, Shoe the results! Chevy must havehad Magic to get those kind of numbers out of cast iron heads....And manifolds.
No sir. It's right on the money. 11.25:1, lumpy little solid cam, ram's horn 2.5" manifolds. Pre LT1 aluminum intake and carter AFB. It's bonifide. Like it or not.