No prob, it's been about 10 years since I bought them but pretty sure these are the ones... Engine Performance & Vehicle Customizing Products From Hedman | Hedman Performance Group
Honestly it's tough to say how much of an improvement over iron manifolds these are and whether it's worth the hassle of fabbing custom downpipes. I actually bought them because one of the iron manifolds I intended to use at the time turned out to be cracked and I didn't want to use tiny restrictive 318 or 360 manifolds.
Thank you, I am looking for an easy low cost option for my 1970 Duster 318.