came across Team Camaro site and found that the truck bellhousing inspection cover is GM 340254 and you can get it at your local GM dealer.
I just ordered one for $21.80 including tax. if you need a adapter ring to reduce the larger hole in the truck bellhousing to fit a muncie look at ....
Dennymac.com you can get one for $28.00 ..jwecam67
( see I answered my own question )