The 1962 and 1963 output shafts were 11 1/4" and had 16 splines. In 1964 the 11 1/4" output shaft was changed to 27 splines but there were still some 16 splines produced as well. 1965 and newer, all Powerglides were equipped with a 11 1/4" extension housing and 27 spline output shaft.
I'm pretty sure your PG would bolt up to a small block but there were different length input shafts available as well which could also give you a problem.
Camel Humped 355 best, 11.55 @ 116
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Last edited by Lugnut79; 30th-May-2009 at 11:35 PM.