I'm in the process of installing the Accel SuperRam plenum/runners/manifold (along with all the other "hey... if you're doing THAT, you gotta do THIS" stuff). My biggest impression of the manifold is that it's cheap-looking. It's smaller on the sides than the stock one, so the edges of the gaskets show. It's rougher on top. The instructions suck. It's supposed to make tons of power, but only in the right combination.
The way I see it, you've got the following options:
1. Stock manifold. Cheap, cheap, cheap. Under $100 on eBay. Port it, add some bigger runners, and you've got a mild, simple, inexpensive power boost.
2. Accel SuperRam. Not really any good by itself, and expensive. Worth getting if you plan to do the rest of the conversion later, but don't pay full price for it.
3. Edelbrock, etc. Don't know a lot about them, unfortunately. They've been around a while, though, and people like them.
4. Stealth Ram or LT1 intake. The first is a bit pricey, the second is much cheaper but needs some prep work to accept a distributor. Either will greatly improve the rev range and power of your car. They are essentially a one-piece plenum/runner/manifold setup so you'd do away with the rest of the TPI runners/plenum as well.
If I were doing all this again, I'd probably go with the LT1 intake. Less parts, looks to be less hassle.
Of the options you mentioned, none will give you lots of extra power without doing other stuff as well...
Hope I haven't confused you more...
[RICHR]
