I have a long crank 6.0 that I want to mate up with my 97 4L60E in my 97 c1500. What do I need to do this swap?thanks

 

5.3 flexplate and blots

 

If you have the flat 6.0/4L80E flexplate that came with the engine,you can slot three of the bolt holes to match the 4L60 torque converter.

 

None of these are correct. You need to buy a converter for a LT1/4l60e and run a flat flex plate from a older style SBC or if you get a 6 lug converter run a 99-00 2500 HD series. If you buy a converter for an LT1 and then buy a 5.3 truck down the road you can use the same converter/flex plate and a crank spacer on the LS cranks.