Hi Simon,
Funny how we communicate here thousands of miles away, yet only live about ten miles apart
Personally, I would pull the motor out from that RAM and Stick in that Stroker you've been building
Seriously though, I think you are best pulling the engine out to work on the mains, I have tried working from underneath before and it is much quicker, in my opinion, to pull it out (ooer!), and work on it out of the car. When laying on your back under a car working above you I find the blood drains out of my arms and you get colder and colder and colder (hope this doesn't mean my heart isn't working right??) - you know how cold it is at the moment. Besides, you need to pull the crank to get to the bearings - this is too much from below.
Sean Graham