If a guy's asking about used heads he doesn't have $1860 for a new set of the Trick Flow 240s. I would recommend calling Todd Marsh and seeing about a new set of Sidewinders, although those may have increased price, too since Trump started playing games with China.
The least expensive that work reliably would be 440Source Stealth heads. $1000 a pair while the price lasts. They need to be gone over and depending on what cam you want they may need springs or some replace retainers and locks, although I suspect that's overkill for a midrange cam.
A used pair for around $650 could be a really good deal.
Procomp I haven't looked at lately.
R.