You can use a length of tubing as a stethascope. It works perfectly for narrowing down the location of a noise.
You said you have pedestal mount TFS heads? Are they used? I ask because as far as I know Trick Flow has not produced pedestal mount heads in a while. If the heads are used, chances are that you have a bad valve guide. The cast iron guides they used in the older heads wore out very quickly and would tick at idle, but go away on the gas.
If the heads are new, I am leaning toward it being a mis-adjusted valve or noisy lifter.
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