sorry if i gave the impression that the TR5 is a "it will have no low end power" manifold,i know it isnt,i just tried to point out that the manifolds with tall plenums are rated for some pretty high rpm while the low plenum has a more sane designed rpmwindow where it works good.
and i pointed at the good midrange since that is where i think these manifolds realy shine compared to anything else i have tried,and the lowend is pretty good actualy pretty close to the airgap manfiold while the midrange and top has been outstanding on the tunnelram even if its hard to judge the diference up there in the higher range.
oh to the original poster if you end up not being satisfied with the taller plenum and have trouble finding the lower version dont worry there is lots of them out there bolted to smallblock chevy tunnelrams of the same type and they are the exact same part and fits perfect on edelbrocks smallblock mopar tunnelram base:cheers: