Thanks all. Scott, the Dyno owner ejected me from the shop when I shared your idea. But, thanks anyway. Chuck
Well, it's actually not an "idea", rather it "is" something that we have practiced many times. And in the case of the "FE's", those with the vertical 8-bolt pattern type heads, and where we're not really "going for the gold", it "is" an old set of truck headers (Headmans' IIRC.) that I most frequently utilize, mounted "up-side-down"; and work perfectly!

O.K. yeah, this puts them up in the air, just don't be too quick, to get too close to 'em, particularly after a shut-down immediately after a full-pull; your cotton clothing will "alight" and the polyester stuff just "melts" (don't ask me how I know)!
But, "Don't knock it until you've tried it", kinda comes to mind.

I've also made spacers, this with two header flanges of the appropriate application and a few inches of pipe, this to set the headers out from the cylinder heads and hence the dyno stand, or if inverting the headers (flip one of the flanges

) away from the valve covers, these also incorporating the taps for the EGT's; this way I can utilize them without having to modify the customers pipes. I figure, adding a couple of inches to the primary tube length, if necessary, to the "actual" headers that will be utilized creates less of a variable from the as mounted in-the-chassis effect, than that as compared to utilizing a completely unrelated and different header pipe set.

Scott.