Well, my advice is DO EVERYTHING YOU CAN WHILST ITS OUT
IF THE ENGINE HAS DONE MORE THAN 50k IT WANTS A NEW CAM, IF YOU CAN AFFORD AN UPGRADE CAM THEN PLEASE FIT ONE, IF YOU CAN'T AFFORD A STANDARD CAM THEN PLEASE #### OFF WHY HAVE YOU GOT A V8?!!!?!
But yeah basically it'll never be as easy as this again mate and I know from the thousands of hours, the greasy fingernails, the aching hands and the smoking wallet that its far preferable to live like a tramp for a few months than to live like a slave to your car for a few years after you didn't fix everything whilst you could.
Absolute ####ing Godspeed to you mate because you appear to be going about this the right way so far but yes you will need all the help and reassurance you can get!