After some thread search I see that backdrafts were apparently made by Holley (for Mercs) , Rochester (Olds/Stude) , Stromberg and Carter for who knows what . I want to run two of them on a 250 cid inliner Chevy , midrange cam ,9/1 comp , headers , no head work . So the question is .... which of these are the easiest to come by , work on and what flow do they have ? It seems , after some research , kits are available for rebuilding all of them but no doubt some are easier than others . Anyone run these puppies and/or have some advice ? I realize this is a little offbeat but that is why I pony up 50 clams every year because someone on here actually knows all this crap .