Long bed to short bed conversion?

[03glide]

I am sure this has been discussed but I'm not havving alot of luck searching. I am in the market for my first classic truck after 15 years of 1st gen Camaros. I originally would onlt consider buyin a short bed. After a couple weeks of looking I notice there are quite a few more long beds available and at better prices. What options are there for converting to a short wheelbase? I guess 1 obvious would be to change frames and beds. Are there any other possibilities? I've been lurking here for a few weeks and the level of expertise and quick respones on this board are amazing. I feel lucky to have found this place. Thanks in advance.
Brian