T/A heads are 915 castings. (the casting number ends with 915)
But...... so are later 340 & 360 heads, even on the 2-barrel engines.
The only unique thing is the intake push rod holes were drilled offset for the T/A rocker gear.
The heads are not hard to find, but the rocker gear is, so that limits the head value.
No aftermarket company makes rockers with the proper offset for these heads yet.
