first of all...welcome to the asf!!!!
secondly...
...52 crouch cooler...
a crouch cooler!!! sweet.
finally...
i'm with the "dont cut" party. i'm definately no purist (i love 'em all), but imho, splits are way too rare to be cutting roofs in. especially a #'s matching split. even if it's had heater channels & aprons fixed/replaced...it's still not worth it...for the sake of originality and resale value (see below).
now...alot of people here (yourself included) have mentioned the resale value of the split should you decide to sell it. the argument seems to be that a split rag (even if it's unoriginal) would gather more cash than a hardtop. i dont necessarily believe that to be true.
case in point (and someone correct me if i'm wrong here)...the randy gates "gates of heaven" split window hardtop and the rich riviera "brown gfk ragtop split" (which i'm fairly certain was an original rag) were two cars that had different looks (cal-look vs resto-custom) but were also two cars that were top shelf restos with all the bells & whistles and all the coolest one-offs and were built by the same guy (buddy hale).
both cars sold for roughly the same price...$65-70k (give or take a few bucks...but if i recall the end prices were not that far off from each other...and again, someone correct me if i'm wrong).
and this was a real rag vs a real hardtop.
my point is...that if a split is built right in the first place...it should gather top dollar regardless of if it's a hardtop or ragtop. but it also seems that split folks (stock or custom) seem pretty picky about the fact that the more original a split is...the more it's worth.
so if you're looking solely at the higher resale value...dont cut.
and if you're looking solely at originality and authenticity...then dont cut.
but in the end...it's your ride to do with as you please...so whatever you end up doing...make sure you drive it and enjoy it!!!