Thanks guys. I have no caps in my valve covers - they are chrome and look fancy, but I managed to get some oil in via the crankcase breather hole - making a tremendous mess in the process!
Straightened out the power steering pipes and toppped it up - actually worked, but the supply pipe seems to be leaking so I will replace them all.
Thanks for the other info too - I have just had a load of books from Amazon delivered this morning so I'll go read up on all that stuff too. '78 Scottsdale 4x4 pickup, newish 350 engine, Edelbrock intake and 600cfm carb with electric choke (does not seem to be connected?), RV cam, 6"lift.