Here are just a few data points. Also, a reminder that this thing had STOCK heads. I think the heads were the restriction, therefore the manifolds did not make drastic changes; except for the really bad ones, the different intakes just wiggled the numbers around by 5-10 hp or shifted them to the low rpm (dual plane) or high rpm (single plane). I'm pretty certain there will be more difference between the intakes once some better heads are on the engine. I find that out at the end of the month.

Street Dominator
3,000: 381, 217
4,000: 449, 342
6,000: 395, 452

Torker
3,000: 395, 225
4,000: 455, 356
6,000: 397, 454

Perf RPM
3,000: 408, 233
4,000: 457, 348
6,000: 392, 448

DP4B
3,000: 419, 239
4,000: 454, 346
6,000: 387, 442

Performer
3,000: 418, 238
4,000: 452, 344
6,000: 382, 436

Six Pack
3,000: 413, 236
4,000: 459, 350
6,000: 391, 447