400 Block...what to look for?

My 400 block in mine is a 76 model and it has an old Jim Hale stroker kit with .020 Arias pistons. I have been beating on this thing since 1994 when it was in my Ramcharger. People what's in it I tell them its an old stationwagon motor. The Chevy guys think I'm lieing when I tell them it has stock rods,heads are 452s,stock rockers and shafts and even the harmonic balancer is stock. Has got me to 11.96 at 112 at 2300ft elevation!