Still don't start? I had the same fault when I wasn't using my supra when the clod weather started, First happened when I was moving my SBC-i color and rewiring it, had it running switched it off done the wiring on the ECU then it wouldn't start checked everything, pulling my hair out for days, checked fuelling, fault codes, Timing, injector pulsing, fuel delivery all o.k. took the spark plugs out cleaned them cleaned out the bores then it fired up miss firing all over the place then run fine, left it for a few days same thing again, done it about 4 or 5 times for about a month till I started using it every day now no problems.
The low compression might be because the oil has run away from the head and hydraulic tappets are not working? Due to it sanding round for a long time.
How was your running before it stopped starting?
Considering it started then die sounds like flooding, once it starts
the fuel could be getting straight back on to the plugs due to the amount of fuel you said that in the bores.
Try taking the spark plug's out clean and heat them, pull the fuse's out for the injectors and fuel pump and crank the engine over for a while (without the plugs in) to get the excess fuel out the cylinders and build up the oil pressure, put it all back together and give it ago. If it starts’s try keeping the throttle open to keep it going but don’t rev it to hard!