If your piston deck or dome is @ zero deck or less they will fit but you'd want to plug all the dimentions into here
http://kb-silvolite.com/calc.php? to find your new CR and you would want your piston to head (quench) to be ideally .040". and to see if your CR is going to be too high. Cometic has custom head gaskets much thicker if you do have a positive deck plus thicker intake gaskets to restore your intake/head port alignment but there's been complaints about Cometic. Some aftermarket mag heads have LA intake pattern and some have the OE mag pattern which will dictate what pattern (need the same to match) on the intake you have in mind. head gaskets the same and possibly can elongate the bolt holes on the LA intake gaskets to work (not sure). Need mag valve covers though I think LA ones MAY be a close fit mag ones would be better. Need the mag specific head bolts/rocker arms/holdown stuff (MP stuff is OK here) and iirc can redrill for larger holddown bolts 5/16 to 3/8 for racing and or a high lift cam, might check on that deal. Plus pushrods and I would not order them until you mock up your setup & find your exact length needed. There are some Ford ones that are a bit taller or shorter (I forget which) than the std MP ones if needed. I would also drill/tap/set screw plug the (2) holes on each deck that feed the LA heads (reverseable if you go back to LA heads) and iirc you are just swapping heads but if you have the bare block on a stand in front of you, you could drill/tap the vertical oiling holes from the crank to the cam then plug them w setscrews & drill a 1/16" hole in each one as that is all the oiling a cam journal/bearing needs and alot of oil is lost past the cam journals. EDIT I reread your post and the 1.6 mag rocker ratio is going to change your (current 1.5 ratio) lift amt by a factor of 1.067, so yes VP clearance considerations also on the piston notches