Holley-branded Stealth Ram high performance TPI intake manifold assembly for pre-Vortec small-block Chevy.  My best information is that it was manufactured by Weiand as Holley P/N 7540 and direct fits '57-'86 iron heads.  It will  also fit '87-'95 Gen 1 iron heads with the correct center bolt hardware (Weiand 90748 or equivalent). Dunno about aluminum heads.  There's no provision for EGR. Manufacturing date is: 10/16/02  This was literally rescued from the scrap heap, so it's a 'wee bit dodgy', but can be restored.  The sealing faces are more discolored than pitted and I see no cracks or prybar bruises.  It's seen some weather, so the throttle is stuck closed and I can't say whether the sensors and injectors are 100%.  You'll want to clean out everything, including the fuel rails and it could benefit from bead blasting, if you want it to look better.  But it's too good to toss, so here's one for cheap, plus a little elbow grease.  I'm not a SBC guy, but I'll try to answer any questions you may have.