I built a dual snorkel TBI intake, something I've been wanting to do. Did it for less than 20 bucks so I thought I'd share. I know it's been done before but you may have an interest. This set-up is on my 77K10 TBI conversion - for reference. The air cleaner sits on top of the Hypertech Power Charger "soup bowl" so there's no indexed spacer keeping me from positioning it where necessary. I used to run an open air K&N element which I stopped using, I don't think they are necessary on anything short of a high performance street motor. I ran it for 4 years and noticed ZERO difference when I switched back to a stock air cleaner. Anyhow you take 2 good TBI air cleaner bases, one is sacrificed for the snorkel. You take your good one and mark the area you want the second snorkel attached to. Then take a little cut off wheel and make the hole, afterwards tack weld your second snorkel in place. Now you have a dual snorkel cleaner. I got rid of the thermatic air doors in the snorkels on mine, you may want to keep them. The next thing you need to do is decide to run your fresh air tubes. On my truck I used the stock 1990 TBI snorkel tube on the passenger side and a 1980's camaro short snorkel on the drivers side. Unfortunately these won't reach through the firewall so you need some extra pieces. Here's the simple way I did it. Go get yourself some 4" plastic gutter tubing and a few 4" gutter tube couplers. A section of tube is less than 4.00 and the couplers are less than 2.00 each. The great thing about 4" gutter tube is that it mates perfectly to your factory snorkels both the truck and car types with oval ends. No on my 77 there is a 4" diameter hole in the radiator support on the passenger side but none on the driver's side. I had to cut a 4" hole on the drivers. Once that's done take 2 4" gutter couplers and run them through the radiator support. They have retaining ribs on their surface so they'll clip right into place and stay there. Once that's done just route your tubes to them. On my passenger side the factory snorkel tube was long enough to mate with the radiator support coupler - that was easy. On the drivers side I had to use the short camaro intake tube & a length of the gutter tube to reach the coupler. The nice part about this install is the way everything just clips snugly together. Here's 10 pictures, not a bunch of fab pics because most of you can cut and weld. Just the gutter parts and finished product.