The final bit of the pipe sits about 1"-1.25" in front of the bulkhead, so if you've move the engine further back than that you'll have problems. Even if that fits, I think you'll have problems with the headers catching on the steering column. I'm suffering and I've got the engine in the normal position (the problem is it's not quite straight in the bay!). You're more than likely going to need something custom made to bend around the upper/lower column joint.
See the latest stuff on my site (
http://www.sumobuild.co.uk/chapter17.htm) to see how close the standard fit is.