My first car was a 70 Chevelle, think I paid $400 too. Owned 4 total. My last one was a SS 396 with a 4 speed and if I remember right I paid $1200. Had the HI Perf stamped on the heads and block.
She's a beauty man !
Man who'd have thought they'd be as valuable as they are now ! In my teen years they were $500 to $1500 bucks all day long. Up in the Bay Area anyway.