I remember some 361 or 413 heads that the stands were pressed onto the shaft & they had 4 bolt valve covers also, wonder if those heads flowed anything significant or what? Haven't seen many- sorry this is kinda off topic, but kinda funny that 1959 or 61 engine had a rocker system kinda what all HP manufacturers & regular auto manufacturers use today, MoPar many years ahead of its time, wish the dual overhead 426 went into production, & the 383 ball stud hemi (poor people could've affored that{383})