Something else i'm looking into is reducing the engines movement in the bay, as we are very tight for space around the downpipe and the plenum, I've got an engine damper to try which i am planning to mount between the old power steering bracket on the engine block and the subframe to reduce lift on the passenger side of the engine and hopefully reduce the slight bouncing feeling when coming off the throttle at low speed. I'm not entirely sure how this will perform, but they're cheap enough to give a try, and we want to keep this car feeling as 'normal' as possible, stiffer engine mounts would of course be the easier option, but i'm a bit concerned they will transfer a lot of vibration into the cabin.
While the engines out we're going to be changing the plugs for some denso iridiums on the recommendation of MSD which will hopefully last much longer than the motorcraft ones we currently have (already misfiring at cold idle) we need plugs that will last due to that pesky number 4 plug being a complete bastard to change. Ive had a check around coolant and IAT sensors to check they're reading correctly, and set up the TPS which was actually a little out so I'm hoping once the clutch is sorted and its all back together we should be good for a session on the rollers!