I am working on a 1937 Fiat Topolino A, I have all the nuts holding the head on the block removed, I had to soak them for a long time until they broke loose. Now I have to remove the head, I briefly tried to use a sharp putty knife between the head and block but I do not want to harm anything. Does anyone have any suggestions for safe removal of the aluminum head? There are 10 - 5/16”-24 studs and two 3/8” studs protruding through the aluminum head. (I know there is standard thread on an engine that should be metric, I am not sure why) This car is extremely unmolested, no modifications like most Topolino’s have. Thanks!