I dont remember all the details on the supra pcv, i would try to look at one at the parts store. They fully close against boost, and AFAIk the mopar ones were supposed to be good also, but i never tested one. On neons.org they used it and said it was good, but I dont know how it looks or if its easily adaptable. I have an SRT4 one on my 2.4 but also use a checkvalve like I said(many SRT4 guys do because they can leak a little). If you get a generic one way valve make sure it has low cracking pressure. The one from McMasterCarr has different sized and you need to buy the hose barbs to thread into it for what ever hose size you want to use.
McMaster-Carr
"Brass Medium-Pressure Spring-Loaded Piston Check Valves" on page 462