Exhaust manifold studs keep or remove

[kcorn]

Need some advice from members who have "been there done that". The coyote engine I am using for my roadster build came out of a 2016 low mileage F150. I have pulled the cast iron exhaust manifolds which mount to the heads with studs that are 1 1/2" long. My inital inclination was to unscrew these studs as I will be using the F5 stainless 4 into 4 headers which are bolted to the heads when a crate engine is being used in the build. However before I take that step I would appreciate any guidance that those " who have gone before me" can provide. In reading the various build threads it seem that the header attachment in frame is a major "pita". I wonder is there room to get the headers into position with the exhaust studs left on the heads? Would installing nuts on the studs be any easier than getting bolts into place and tight? Any other recommendations ?