Well what I think I am going to do is try to buy a plenum off ebay, or a parts place. This way I can do things to it and check the changes in performance. I value everybodies opinion here, so I think that buying an extra plenum for a resonable price will be the way to go.
I have a plenum here if you're interested. It's stock, untouched. Only thing it's missing is the little power brake booster nut in the back because I took that off to use when I stripped the nut on the plenum that's on the car right now.
I've also got a stock plenum from an '88 I think. I bought it to replace my plenum while I was porting it. The only differences I can see are its got one less vaccuum port on the passenger side, and no screw holes for the MAP sensor. It works fine was even painted silver (not a very good job though.)
You may have a hard time finding one as GM has discontinued them.
I'd be willing to let it go for a reasonable price.
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