Don,just noticed you mentioned gas scale ,which is smaller than 1/6 scale.I have found that Eddie's 1/6 scale drivers look too big for gas scale.He has other sizes.The 1/6 scale exhaust look good in my opinion.I have combined them with Doug Campbell's 1/6 scale Merlin kit on my 67 Bud.I think you are building an 8255 hull though, which only needs the stacks.