OK thanks Iowa Eagle and reverendbill,
I was thinking the bottle jack idea would work better 'cos of the restricted space. My only concern would be that the pan is pretty thick steel and might move over rather than dent and bust the pan bolts out or if the pan bolts stay put, rip the metal around them.
BTW. The reason I say it's likely to be a '65 '70 (and not '70 to '80 as advertised) is 'cos of the bolt pattern on the driver side. (I'm sure you already know this), but I discovered, to my shock and horror, that the bolt pattern is evenly spaced on the earlier pans rather than the later pan's which have two of the bolt holes closer together.
The confusing thing is that you will get the same gasket set for both styles but with a choice of gaskets for the driver side. However, as far as I know, you can't get a one piece permadry for the earlier '65 to '70 type pans which is how I deduced that they were different from the later style as regards to bolt pattern. From what I can tell and feel free to correct me if I'm wrong, I discovered by cross referencing that the oil pan bolt pattern remains the same from '71 to 2006.
Cheers!
tony and nicki