I haven't seen anyone doing a LSx swap with T56 and attempting to keep a bench seat. However, I'm restoring the interior of my base '68 to near factory look, and I'd like to keep the bench seat. Possible? Or will I end up having to notch the seat?
i'll venture a guess that if the t56 is anything like the TKO then it'll be a matter of the shift handle. it might not be the exact "Performance" handle you'd like to use but i'm thinking you might be able to install one that'd clear the bench.
i have a TKO in my '64 ChevyII with buckets so i'm gauging off that... maybe i'm helping, maybe not.
It appears D&D fits a custom-cast extension housing that includes a provision to use a GM-style mechanical speedometer drive and a GM trans mount. The shifter with this extension sits 2 inches farther forward than a typical LT1-style T56 trans.
Lou Santiago did what you are doing on Muscel Car before they canned him. He had to make his own trans tunnel and bench seat to get it to fit. You acn look it up at PowerBlockTV.com and watch part of it. They have the whole project on DVD from start to finish entiltled "Project Blue Hair".