T/A heads were J heads with unique adjustable rockers. The T/A heads had the pushrod holes moved outboard so that the heads could be ported larger, so the rocker arms are offset to compensate. You have to use the T/A heads and rockers together....
273 adjustable rocker arms will bolt onto any "standard" small block in place of the stock stamped steel ones, but you have to get the proper pushrod to match if you're going hydraulic or solid tappet....
