The answer to every oil question is: It depends.
What are the bearing clearances, and how are you using the thing? What do your oil pressures look like hot at idle and a WOT?
What is the oil recommendation from the lifter manufacturer? Erson told me never to use anything heavier than a 5w40 with my lifters. The cold weight is important. If there's not enough flow into the lifter at startup to pump the lifters up, you'll get a bunch of loosey goosey pushrod action and it'll make a ton of noise and hammer the cam bearings.
You can switch back and forth between synthetic and conventional. That's not a problem.
Where's it leaking?
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