ya i would just chop the flange off if you can and then use lil piping and your good. that is if your trying to do it on a budget

 

agreed shouldnt be to hard if a guy on here can make a log mani out of cast plumbing pipes you can make one one outta a ls mani

 

If you have a two piece cast design with steel piping bottom and lots of free time try cutting the two bottom pipes. Get some mandrel tubing bent or pie cut to 90 degrees and build yourself a nice top mount set up. Been done many times

 

yea, pretty simple IMO.. fabrication makes anything possible. lol