The Spearco has much more flow and a much more efficient core than a stock 87 IC. It's small by today's standards but almost identical to the Kenne-bell "big boy" from the old days.
Apparently this Spearco that comes with the hot-air conversion kits flows 1080 cfm and will support up to 760hp. Its 18.48 X 6 X 3.5 (two cores put together).