Help identify aluminum heads

Just got off with mahle, which BTW has one of the best customer service support departments I've ever dealt with. If the heads are the speed masters 78cc the CR is approx. 11.8 to 1. We know the piston & the rod is a 7.1, I do t have any info on the crank though. Assuming it's a 4.375 the engine would be 520ci