Just call trick flow as mike says.
They will know exactly what they are.
I have called them on multiple occasions.
Apparently they keep really good records.
Just got off the phone with Howard at trick flow. He was very helpful. These are 170cc twisted wedge heads. 202 intake 160 exhaust. 61cc combustion chamber. I told him what cam I'm thinking about using and he even gave me a pushrod length and lift of 540-550 with 1.72 rockers. Great customer service.
I'm not so sure i'd take their advice on pushrod length for a set of heads you don't know the history of.
If you are buying rockers, buy 1.6's and use a cam meant for them.
Pushrod length can vary if the heads have been milled at some point in their life, or if the block has been decked. This is why I would measure for pushrod length and then order. Head gasket thickness is also a factor.
For example. for the TFS170's I've often heard the ideal pushrod is 6.700-6.750". However, when I measured multiple times, I got a much better pattern, and closer to 90* to the valve at mid-lift with a set of 6.800" pushrods. So that's what I ordered.