to make it a clean looking and functional job you need to find a big gmc 350-450 series truck. they came from the factory with the pvc valve, pipe and breather/oil filler pipe. you will also need an intake manifold that is tapped for either 3/8" or 1/2" npt. plus the little vacuum manifold that screws into the intake. plug the connection for the two speed rear and hook up you wiper line to the 1/4" connection. if you still have a 1/4" tap left on the manifold you can top that off with a vacuum gage which will come in handy at some time. plus you'll need the valve cover with the hole in it for the S pipe. if you find a bigger truck just take everything off of it and swap it over to your engine. my ashton which is a 350 came that way and it originally had a 248. the valve train will stay much cleaner when the air entering the engine is filtered. the breather is an oil bath type which can also be modified to accomodate a dry element. luckily for me i found a 46-350 that has the same script on the cover that i was able to convert my 40's 270. i used it on the 228 that was in it until i upgraded to the 270. find everything you need is the hard part unless you know where a big truck is lurking in the weeds.
