Not sure for the GP but for my 76 TA when I swapped from TH400 to 2004R I used the same cross member in the same place and only had to use a slightly taller tranny mount, the same drive shaft with no length change, a new yoke (GM 27 spline), no mods to tunnel, used same B&M Mega shifter that came with ability to go to 4 speed, added a TV cable set-up and used great instructions available from Extreme (and elsewhere I am sure) and a Comp Cam mount kit (304147) for my Sniper since the universal mount was problematic, and I was highly advised to get a good cooler with fan (went to the Derale 13720 for the recommended specs - could have went cheaper but wanted to get past nervousness from over thinking) and matching inline thermostat Derale 35020.
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