You definitiely need a paper gasket between the hard plastic spacer (that the PCV line comes from, the hose with the red stripe in the picture) and the manifold. The thick paper insulator should seal on its own, but it won't hurt to put a thin paper gasket on either side of it. If the prevuous setup only had a
thin gasket on top of the paper spacer, then that's how I'd put it back.
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk