Spyder,, The bolt can be put in while the motor is tilted,

but un less you have "no" clearance problemns and can start a bolt,,,, do it ,

but some sbc engine's like 262 originaly from the factory had a bolt missing or installed but genaraly it is left out on a lot of models maybe after GM warranty repair on the trans,,,I have not personaly tried,,even with the 3/8Th's inch drive "wigler extension,,,or finger's meathod and hand as big as mine could be the problemn on starting the bolt,, My distrib cap removed and the dist base against te firewall we could not start the bolt,,Damn 75 larger tranny tunnel ,, LOL,, Mike