Anyone know why someone would do this combo?

My 86 GT Fuel Injected has an 87-93 block with valve reliefs and a ported set of e6 heads with bigger valves...unsure on the cam size pretty good lope/duration though, there something I'm missing but wouldn't that make for a lower compression combo?, the heads don't seem to be milled down at all. The only thing I can think of is someone was hunting for some serious Forced Induction.

Unless the previous owner had a good set of heads on the car and threw the stockers back on?

What do you guys think ?