I have had the same problem with heater controls there is a vac line that runs into the fire wall in the area of the fp regulator it has a check valve with if I remember correctly 3 lines a small plastic line that goes into the firewall was pulled loose after reconnecting problem solved I would...
the intake you are talking about (I think) is a custom intake it was a ram jet intake for a 350 that someone sent to a machine shop and had a section cut out and then rewelded the intake back together it was pretty pimp a$$ if you ask me I think it was someone from chitown syty not sure though
me gots a tailgate already shaved just needs paint and to inslall its fully shaved I also have pics of one on my s-10 but I dont know how to post them if some one can help I can email them
did some searching found a link that might help http:/www.fortunecity.com/silverstone/studebaker/135/buildty/buildty.html
if you decide or have the funds to build it post some pics