Driveshaft/crossmember question

[cmc89]

I have a 66 c10 2wd long bed I'm doing an ls/4l60 swap in. I have tried searching for a clear answer to my questions everywhere but can't seem to find any. The truck will make around 500hp give or take and be sitting low. It originally had a 2 piece driveshaft. I'm wanting to switch to a 1 piece. Comparing the original shaft to the driveshafts they use in trucks today it seems the crossmember will need to be changed to allow a bigger diameter driveshaft and possibly accommodate the lower ride height. So I guess what I'm asking is it as simple as changing the crossmember and having a driveshaft made or is there more to it than that? Thanks in advance for your time.
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