Another fan motor fix.

So was this a "drop in" change aka unbolt the stock one and bolt this one in? I need a smaller motor especially with the Trick-Flow heads on my 440. The other mods I've seen have you doing some welding and other mods to the blower motors and frames.
Sane here with the valve covers.
I was going to try the one that pushed the whole box away but did not like the idea of trying to align the vent to the cowl. PIA as it is.