the difference in the trim was the area that meets the dash since the dash's are not the same. If the triple pod is a full piece or an overlay that is contoured at the end to fit the later style dash then you will have a problem and will have to run a double pod that overlays in the middle of the a pillar trim or you might be able to fab up the triple one.
I know thats what you want but have you seen the dash gauge clusters they have? mount kinda infront of the passenger see on the dash. Personally I think they look awesome.
yea that would look sweet. your talking about the one that holds the monster tach and 2/3 gauges correct? except i have a different dash than you, and nobody really makes any good gauge mounting options for the 79-86 cars