Good score on that eng . From everything I have read or seen about the heads, It's as good as the classic / vintage inline alumn heads.
Jeff Jones on the Vintage 6 Mustang facebook page recentley did a comparison of a ported big log modified steel head,the Classic inline & one of the Argentina heads. The head bolts straight onto our 200/250 engs with no modifications un like the Australian cross flow head . As stated the exhaust manifold is not interchanagble with our 200/250 .
If you find you need some exhaust or intake gaskets it's possible that Jose Alverz on the Vintage 6 Mustang facebook site can supply some .
After cranking several small block Ford engs that set for 10 20,&25 years recentley that all ran excellent, 2 of which I own . I'd be inclined to oil the cylinders up ,prime the oil system , put it on a stand & fire it up .