Talk me out of this please!!!!

[ksjh1316]

I am out of town working and my neighbor across the street gave me a call and wanted to know if I wanted to buy his 84 burb. It is a 454/th400 combo ps and a/c powertrain was rebuilt 30k ago and runs well. No rust but has been a work truck for years tailgate and doors are good as well as the hubcaps interior is trash. He then shoots me a price of $400 and pay him when ever just wants it out of his drive.

How bad will it be to use this set up on a 67 SWB frame. I am really tempted to do this let me know what you think, you guys know a heck of a lot more than me