Edelbrock Pro Ram II tunnel ram for chevy???

Ok I just bought this tunnel ram for the heck of it, the price was right. Anyways I can't find a spec out there about it? is this an old tunnel ram which is not produced anymore? I was wondering if it had clearence problems with H.E.I. ignitions and stock heads (all years) cause I know some tunnel rams can't be placed on stock 87 and up heads........ well thats about it, I've been a reader here for a long time but this is my first post. I hope someone can take the time to teach me a little bit about my new tunnel ram. Thanks guys.... or point me to a link.....