5.2/5.9 H.P build guesstimate

Slantsix64 said
Your right! I’ll probably use the play dough method,

I like and suggest clay. Play-do is a bit more pliable.

Slantsix64 said
should I just reuse the factory gasket torqued to spec because it’s probably way more thinner than the replacement I will use,.

The reuse of the OEM gasket for checking purposes is fine. I’ve reused head gaskets over and over. A new one is always a good bet. Cometic can get you the thickness you want if it is not commercially available.

Slantsix64 said
that way if I have clearance with that gasket I should be fine with the after market one.

I check without gaskets.
I doubt you’ll have a problem.