That's a neat little piece! Never seen anything like it before! If I were you I'd switch out the engine for something a little older and slightly bigger and get it off those rubber mounts it's on!
Do you know for sure that it is a pc or a motomower or lawnmaster. There is a tag affixed to the steering shelf near the steering wheel with a tag but it won’t tell much and the. Original motor will give you a better chance of knowing. Because it has the cast foot pedals and aluminum steering wheel it is an old model but it’s hard to date.
There’s no tags on it. I’m just going by the guy that I got it from and he wasn’t really sure it came in pieces but it’s a pretty cool machine. I have a 6HP Briggs & Stratton I’m going to put on it.
I have the same porter cable, if not very similar. It has the original engine and a mowing deck. I've got a few videos on it, from years ago. I'm looking to sell it, let me know if your interested.