1970 5.3l 4l60e swap questions

[Brandon_70]

I recently purchased an 1994 Silverado that has a 5.3l swap out of an 02 Tahoe. I want to transplant that engine and trans into my 1970 C10. I know I need new motor mounts, harness and have the ecm flashed, but my question is do I need a new crossmember for the transmission? I am currently running a turbo 350. What else would I need? Also, I do not mind running an inline fuel pump, but any suggestions on what gas tank will fit under the bed? Any info would be greatly appreciated. Thanks