Nash dont sweat it i have 500 miles on my engine and its out and torn down right now.I am playing with a few things like cylinder wall thickness and different rings as well as playing with windage trays and crank scrapers.If you need a 400 short block i could probably hook you up with one for you to rebuild or put one together for you although shipping could get a bit pricey.Hey would they let you put the short block on a blackhawk? Maybe you could fly up here and pick it up...just kidding. good luck with whatever repair you do on the ol' bird.