That' right, in mid-1958 there was a 430/400hp option, 6v not 8v, 3 2-barrels on top. Very few made, estimates are 100-200 cars total. 1958 only.
Much more common was the 1958 430/360hp 4-barrel, and it was, well, its been called the "Bulldozer" and I agree. Nearly the same for 1959.
My dad also had a 1960 Merc, 430/310hp 2-barrel. I still remember riding in it. BIG. Not real fast though.
Later on we had a 1958 Merc 430/360hp 4-barrel, HUGE difference. If you've been in a 1969-70 Ford 429/360hp Galaxie or Marauder, the early 430 Bulldozer is just about that strong - w