True. For a non-restoration, these generally perform better at low rpm compared to a similarly round-back with the same rating.
There two
styles of alternator housing from the 1960s through the 70s. A point of clarification because this
is only true
if a later alternator was installed.
The squareback was introduced in 1972.
http://www.hamtramck-historical.com/images/serviceHighlights/1972/1972 sh p24.jpg &
http://www.hamtramck-historical.com/images/serviceHighlights/1972/1972 sh p25.jpg
All 1971 cars originally came with an isolated field round back alternator.
These were introduced across the 1970 product line.
http://www.hamtramck-historical.com/images/serviceHighlights/70 sh 71.jpg
These are mostly of interest to someone restoring a '70 or '71, especially if it has the correct casting number and date on both halves.
A pulley swap is relatively easy. Most traditional parts stores will do that for you.
