What to do with a blown 360?

hey rumblefish! Ha I haven't been actively on here for a few years but I still remember you being a pretty active member here. This engine was the old engine out of 7172dusters car. It probably only had maybe 1-200 miles on it since I've gotten it from him. It was a long process putting in and to be honest I would like to have it dyno tuned before it went back in. The only thing I can think of that would have went wrong is maybe I had the timing too far advanced? It never really pinged but once in a while at low rpms it would have a hiccup for a quick second then keep running again. I know it was build pretty stout so I feel I should put both head gaskets in to make sure they match. The funny thing is I was just cruising at around 20-30mph at maybe 2.5k and then it made a bang, and started pouring out smoke and quit. It did start back up but was spitting coolant through the exhaust and ran like crap. Shut it off right away again. Didn't hear anything that would suggest any bottom end problems.