4L60E/LS6 flexplate alignment issue

[LS-K]

My swap:
CTS-V LS6 into '82 K10 SWB 4x4 mated to a 4L60E

After debating with myself and brother over this, I decided to pull out the 700R4 and go with the 4L60E. Mind you this is after I had purchased the Advanced Adapters (AA) flexplate and adapter kit (the one used to mate Gen III engines to older GM trans.)

I got a smokin' deal for a 4L60E from a totaled 98 GMC Jimmy for $250 (removable BH), the catch was, I had to remove it. Fast forward to install time...

I removed the AA flexplate and adapter, installed a used flexplate that I was told came from an LS1 F Body. Ok so great, I went ahead and kept the donor transmission's torque converter, keep in mind it came from a 98 GMC Jimmy, a 4.3L V6.

I figured all 3-bolt TQ's should have the same bolt pattern as any 3-bolt flexplate, well I guess I'm wrong because once the trans. and T-case were on the truck, it was a no-go!! The V6 TQ I kept from the 98 GMC Jimmy did not fit the "F-body" flexplate I slapped on there. It appears the bolt pattern did not match up.

Another thing I noticed was the gap between the TQ's snout and crank's ass end take a look below. If you guys are trans. saavy, please chime in guys, I've beat my head over this, please let me know if I screwed by keeping the V6 TQ. Should I go and get a matching TQ/flexplate? ie. 2000's Chevy Silverado TQ/Flexplate combo? Any and all help is welcome!! Thanks.