The mechanic who did mine had a little trick, although I thought it was pretty crazy to do it, but it did save a lot of time.
He held the crank bolt w/ a huge almost 2ft long breaker bar and had a guy climb up into the car (it was 6.5ft in the air on a lift) and crank the engine. The bolt came loose that way. Now the guy is about 6'4" and 280lbs, so he had some strenth and weight behind the bar so it didn't wind up and smack him in the face. He even said it was dangerous, but told me it was a trick of the trade. It sure made quick work of getting the bolt loose.
I know this may not help you in a driveway install, but thats how it was done on my 4.6.
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1997 Thunderbird 4.6L: Dynomax cat-back, MN-12 perf. offroad downtubes and Y-pipe w/ Magnaflow resonator, 80mm MAF with cone filter, B&M trans cooler, Inject-Tech chip, MAC U/D pulleys, KVR front brake upgrade. 15.2 @ 91 before exhaust & pulleys. Not bad for a 3800lb auto 4.6L
No Longer own: 91 LX 5.0L 5 spd
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