It looks like the mounting brackets are different from the powerhouse.
Will I need to do any mods to install the correct or non Powerhouse gen? Or should it bolt right in?
There were different timing gear covers but they could likely be made to work with shims or something of that nature but I'm not sure how much different they were or which cover the OP has. Some of the lower coolant feed tubes were different as well but they were made to clear the powerhouse so it likely wouldn't affect the smaller type generators. It just depends on whether the engine is an old one from 1928 or early 29 or if older parts were installed to fit the powerhouse unit to a later engine. A lot of the 1928 cars had the solid front motor mount to the cross member so that might have affected the timing cover as well. The powerhouse generators have been found on original mid to late 1929 cars so they were intermingled with the Autolite types for quite a while.