Thanks for vote of confidence Surginess but in all honesty i only have experience with head gaskets and setting bump clearance on my engine, it has been really reliable over the last five years and a good starter. There are i think two members on this forum who have the full workshop manual ( for the HDW ), without that i could not advise on pump timing. Personally if the engine was running when submerged i would at least make a compression test and compare the figures. Like i said before a top end strip down and rebuild to check for damage is not a big job. I think the head gaskets on HDA are copper and can be annealed and reused, I will have bump, valve clearances and head nut torque figures written down somewhere ( again for the HDW ). Merry Xmas btw.