Ebay...Slant Six Turbo Setup.

If you used a 4 bbl intake on the motor you would have to reduce it to fit the single hole on the turbo so it is of no advantage. Just use a single hole intake, this is all that the Buick intake had. You still would want to use a 4 bbl on the inlet side of the turbo. The Buick unit has the carb base bolted direct to the turbo. It is actually a spreadbore pattern so you have to use an adapter to put on a squarebore carb. There were some 2 bbl turbo cars in '78 only but most people ordered the 4 bbl option. Don't get me wrong it is a pretty good setup because it is simple. When I said don't waste your money I meant that that unit on ebay was a little pricey. The Buick turbo is an all self contained unit including the carb base & wastegate so it makes it an easy thing to bolt on. If you make the pressure side of the turbo to large it will be harder for it to pressure up which will cause lag. The smaller you make the intake path on the pressure side the faster the pressure will come in. Remember the fuel/air charge moves under pressure so it moves much more easily than the engine trying to draw it in.

Chuck