1964 bed conversion

Can anyone tell me what's the difference between the 1958 and 1964 slongbed stepsides?
I know the wheelbase is different and I would replace the fenderwells a bit forward proberbly.
But how much and what are the pitfalls?
I can trade a 1964 stepside for a 1964 fleetside bed and want to put it on my 1958 longbed truck that I do not have a bed for.

How much work would it take to make the conversion
I suppose I need other stepplates as well
Does anyone have a site or youtubelink to go to.
Do not want to reinvent the wheel


a chicken may have wings
but it doesn't mean it can fly

 

Here's some good info for ya Tony: http://www.mar-k.com/bed_side_interchange_long_gm.aspx

 

Thanks lakeroadster

This is real handy info
I will try to figure what's what and make this work
thanks again