Question is answered: 273 Engine Block Decking

Are your heads open or closed chambered? There has been some debate on whether the 4v pistons are clearanced for closed chambered heads but IIRC, they will clear on a stock block. .015 is really just a clean up cut so Id say no problem but you can always mock it up prior to torquing. Lay the heads on without head gaskets and 1-2 head bolts snugged and rotate the crank 2 revolutions to see if it binds. If Packard is the same Packard that made cars back in the 40's, they were the only car maker in US that Rolls Royce deemed able to produce the Merlin V12 motor due to its very tight tolerances.