Now it had damn well better be tip top.
Put the motor back in with a comealong, double checked cam timing, valve clearance adjusted again, new springs on the starter and idler gears, new oil and filter, double checked all nuts are tight...push starter button and it won't turn!
Drain oil, pull sidecover again, pull and disassemble starter, find that one of the brushes won't move. Find another brush plate, reassemble starter, reinstall, sidecover back on etc.
Lights right up. Will find out how it runs in the morning. Need sleep.