50th anniversary find

[75gmc454]

I found a 68 anniversary truck near where I live. I passed by this house one day and it was just sitting there, so I stopped to ask about it. The truck is a lwb custom, it has the 551 paint code, with either 307 or 327 with 3 on the tree. The truck runs good but the trans does not shift right. The only dent the truck has is on the drivers side of the bed (the side would have to be replaced). The truck also needs rockers.
He wants $650.
Should I buy it? I figure that the opportunity to own one doesn't come along very often.