based upon a suggestion in c.l.py, this slight expansion of the
OverflowError message seems reasonable.
diff --git a/Objects/longobject.c b/Objects/longobject.c
index 38ef89c..7c4f75d 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -211,7 +211,7 @@
 
  overflow:
 	PyErr_SetString(PyExc_OverflowError,
-			"long int too large to convert");
+			"long int too large to convert to int");
 	return -1;
 }