I think at the point it's slid back enough to uncover those bolt heads, the only thing you've not done so far is set it down on the ground.

You'll need to have taken off the crossmember, driveshaft, shifter. Undone all the bellhousing bolts. And then slid it back, probably to the point where the starter bump on the bellhousing hits the firewall, if you need to ga farther back you have to rotate the trans and pull it farther.

I guess at that point you could still have left the clutch cable and reverse light wiring on. But really, if it's that far apart, just go ahead and set it down and check the clutch plate condition while you're at it. Maybe ponder doing the rear main seal if it's got a fair number of miles on it.
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'63 PV544 rat rod, '93 Classic #1141 245 (now w/16V turbo)