Thank you all for your insight.
I have the correct pushrods (although I nearly missed that one).
Other than rubbing the new lifters with plenty of lube and
oil I didn't soak them it's annoying how a couple of them have gone pumped.
Is it still possible to set the preload with a hard lifter, there's movement there with enough pressure? by feeling the pushrod for slack then add 1 turn as recommended by Comp Cams for my lifters / rockers.
It looks like I need to raid my piggy bank again for end stands etc then.