Going from auto - manual (t56 style)

[68protouring454]

you can use the bellhousing from the lt-1 and go directly to the 2 peice rear main seal block, then get the conversion flywheel from mcleod,centerforce,ram,spec and also the pull off style clutch
BUT in your first post it says ls-1 t 56 which has a longer input shaft so you will need the mcleod modular belhousing (which comes with adapta pilot bushing) so it spaces the ls-1 t-56 the correct amount off the 2 peice rear main seal block, then you will need whatever 168 tooth flywheel for your motor(depending on internal or external balance of motor) and a ls-1 style push on clutch.so what year tranny is it?
if its 93-97 you need
1.tranny with bellhousing
2.153 tooth flywheel for lt-1 t-56 to 2 peice rear main block and lt-1 hydraulics
3. pull off style lt-1 clutch which is 10.5 big and not desirable for high hp/tq

if its a 98-03 t-56
1.tranny
2.mcloed bellhousing for retrofit of ls-1 t-56 to 2 peice rear main block
3.a comparable clutch for set up, a twin disk or a 12 inch single disk
4.stock ls-1 hydraulics which ls-1 has a hydraulic throwout bearing
again call ats