I bought 1959-1960 B9AE 292 motor. The guy said it was used to run a pump for the DNR in northern Wisconsin. The problem I have is that cylinder heads don't have the traditional casting numbers on them, where there suppose to have a casting number it is blank.. All I see is "D11" cast on the end of one and "D13" cast on the other. Hand stamped on one head on the end is "4233". I did a search and of curse is struck out.Any insight would be helpful. Thanks Gentlemen.