It is for LWB/SWB and was designed for Headers, but if you get your downtubes made these will work. The company that makes them is Pypes Exhaust. I am a distributor for them.
Swervin Ervin on this board installed the first one I sold.
This is the direct link to them in my catalog.
http://www.73-87chevytrucks.com/merc...ode=73-87UHood
I have the spec sheet scanned if you would like to see it.
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Chris Lucas
1973 Chevy C-10
1978 GMC Jimmy (2WD) - SOLD
1987 R10 twin turbo LS
1991 R3500 SRW CrewCab
1985 K5 diesel swapped project
1989 K5 2WD conversion w/ Vette susp Project
Captkaos Customs
73-87chevytrucks.com