Well I'm not saying that I have parts for sale - sorry. I am already running TPI and I can tune the ECU however I want. So I was saying that your intake could be swapped onto my engine. But really, I don't know if that intake fits a big block, small block, early heads, late heads, etc. Plus, I like the mid-range torque of the long runners and I would expect that monster to be for high rpm. Who knows.
As for it being a modified TPI plenum, how would the runner holes have been filled? Pretty nice work if that's what was done.