here ya go again...the TA head is nothing but a J head with offset pushrods...the TA head share the same casting number as the 71 J head but not the same part number which is not on the head.
does the head you say is a TA head have adjustable rockers with an offset rocker on the intake...if you answer is no...then it is not a TA head...but J head with the same casting number as noted above.
TA head in stock form offer no performance advance...pushrod is moved out of the way to allow for additional porting of intake...
and most TA heads have an O or U casting..which is just a J head also..picture show the FACTORY TA rockers that fit the TA HEAD,,,,