Has anyone ever had to use the adaptor plates which allows a later model pontiac engine to mount in a first gen subframe, and if so did you run into any issues? The instructions that came with the kit says the boss on the block may need to be ground down in order for the plates to mount flat against the block. From what i can tell i may have to do exactly that. I'll post a pic below. Surely im not the only one whos been faced with this. Let me know what you think, is there something im missing here?