5.3 and m20 mating

[clear-lake-gmc]

i have read at length on this subject so i know its an easy to do pairing, i have a complete donor truck with a 5.3, a 10 spline m20, big block scattershield, sachs1050 flywheel.

my question is people recommend using an older bb 11" clutch i got my flywheel off of rock auto and searched clutches for the 6.0 flywheel(sachs1050) i ordered and they are 10 spline aswell, questions is will the stock 12" clutch work with the m20? id rather have the 12" than the 11" with the 11" i have to drill out holes on the pressure plate case and knock out pins on the flywheel, and the cost of the 12" is rather affordable. the 6.0 has the nv4500(gas) trans the nv4500(diesel) has a beefier input shaft at 1.25 i think, are the input shafts of the nv4500(gas) similar to the m20 so i can run the 12".

i havent been getting notifications via email so i may not respond right away but will try to check in regularly.