I'm with Jon on this. Search and you won't find much good being said about THAT year e-88 head. Now if you find an early e-88, like late 71, then you are in a different game. I wouldn't waste the effort and lot's of money to get that 73 head to work, find something else.
Also, nothing against Schneider cams(MSA), I run one with good results, but the cheaper -maybe better route is to get a stock reground. Do some more research