You can do it, I did that with my M-body install...the key here was:
1) crank down the T-bars as low as they'll go w/o compromising the ability of the suspension to hold the weight...this may be a step-at-a-time kind of a thing, meaning: crank 'em very low at first, then as you prepare to actually bolt things up you bring up the T-bar tension so that the added weight of the assembly does not bottom out the suspension
2) use the engine crane adjuster/bar with a tilt, that way you can 'navigate' the engine_trans combo through the front header and floor tunnlet gauntlet
Without that tilter I do not think it would be possible.
These are the pics I took...hard to believe it's been nearly 20 yrs now...holy crapola!!! lol