SOT: Need to make an intake plenum, considering Al Options

[Dr Evil]

Hey Folks,

I am looking to probe your colloective intellect [sound of rubber glove snapping](eeewe). I am about to embarque on a quest to install a 3.0 CIS system onto my bus corvair engine. I can not just put the stock 911 setup onto the engine because the tubes are not set up correctly and it would sit way too proud for my engine bay. So, I am planning to make a simple box plenum with 6 outlets to each cylinder. My intention is to have the distances from the box to the individual cylinders be identical so the box will be about as long as the engine and only as wide as the fuel metering gear. I will have it with 6 stems poking out and will use hose to connect the stems to down tubes bolted to the heads (much like our stock /4 stuff).

Question, I have a cheap flux wire welder that works fine, but I am thinking that I want to make the intake parts out of stainless (do I?) as the mild stuff that was originally on there corrodes and rusts and that is not ok. Can I weld stainless with my ghetto welder? Do I need special wire? This will be non-load bearing for the most part. The welding should be easy once I get the materials and tools needed figured out. I will make a box, weld it, weld stems onto it, yahtzee!