Surprisingly, the smaller plenum seems to have the opposite effect on low end torque. If you look at the old ads when they built both race tunnel rams, and street tunnel rams, the race were the smaller plenums designed for high rpm engines, and street were the large plenum tunnel rams.Ditto on that. Maybe I'm imagining things but It looks a little shorter in the open plenum area than the later tunnel rams so Im thinking by the top plenum area it may be more low end torque than the weiand tunnel ram that's out now or even the edelbrock one. I would call edelbrock tech and ask them what it was made for or what combination did they intend to use with that one. If I didn't already have the offy 2x4 already I would consider buying it from you.
Let us know what you find out.
This one is on ebay now over 200 bucks bids not over till tomorrow.