I just rebuilt my 1983 Wedgewood three burner range. (same as yours only much older model...)
The only insulation I had was inside the oven door. Nothing on the bottom, sides or under the top.
The design hasn't changed that much over the years. The rear oven vent is channeled through a duct and the bottom is a double sheet metal arrangement. (that's the place where I found a LOT of rodent droppings...)
The manufacturer specs for minimum clearance calls for at least one inch from combustibles on the sides and back (the sheet metal provides that on the bottom and back.)
To be perfectly honest, if you have already installed new high temp insulation, I would leave it. these ovens are typically inefficient and loose heat pretty quick.