Headers on stock 66?

i ran the shortie headers for a while in my 66. never seen long tubes for it though. depending on your transmission there may not be room to get the long tubes through the opening to run your exhaust. mine was pretty tight just running 2 2 1/4 pipes down through there. cant imagine 6 smaller pipes fitting. im also running the 3 on the tree so i have all kinds of linkage going through the same opening.