its about time to change my plugs in my 1989 gmc r3500 with a 454 and th400.i was wondering are the ac Delco platinum'* worth the extra money or should i stick with the CR43TS it has in it now?i was lookiing at the AC Delco 41-803 and was wondering is it a better plug or better off sticking with the oem plug type.

Yes lots of plug options.
Is your 454 the carbureted version? Is your Truck happy with the Pro Delco'*?
Are the plugs fouling at all? If you were to pull a few of the plugs, how is the color burn condition?
I like spark plugs where you can set the correct gap easily, & generally would recommend any of the the owners manual recommenced spark plugs.