Newbie with driveshaft question

[Frankasaurus]

Hi there, first post. I have a 66 long wide bed, that has been lowered. I yanked the straight six and three speed for a sbc and th350, so the driveshaft isn't going to work (too long). My question is thus: should I shorten the original or get a new one? I have a friend who has a lot more experience with this stuff but less than he thinks, and he says not to trust the original and to also go with a one-piece. I thought I would ask people who have done this rather than someone who thinks he knows everything and really only knows 1/4 mile dragsters. I'm not really into the cheapest method, just the best. Thanks in advance!
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