I doubt this is exactly what you are looking for but I have a 4.3 TBI with a 5-speed manual that can be bought.
$500.00 for the pair (+shipping)
It is coming out of a 92 fullsize that is getting a 5.3/T56 transplant.
'92 Fullsize, swb rc
5.3L/T56 conversion, comp XR275 HR cam .566/.568 lift 222/224 duration 112 lsa, crane dual springs, trick flow push rods, K&N Filter, Nelson Performance tune, Keisler shifter relocation kit, Boyd Coddington Smoothie II 18x8 235/55 up front, 18x10 295/45 out back, 2/4 drop, eaton lsd w/4.56 gears