Trick Cast T6 Twin Scroll Manifold 73-91 Fitment?
 

At first glance it doesn't fit my ls swapped 81 sierra. It looks like it will have frame to manifold clearance issues OR it will be very close. Can anyone confirm if it will fit or not without modification? I don't want to starting taking off my headers just to find out it doesn't at this moment, I'd rather ask first.