Old Truck value

I missed out on an old FLD it had a broken frame. I was thinking of buying this one it’s a 87 WSTAR with a bad 855 Cummins 3 in it. It has new tires all around, wet kit, new front rear end, starter, alternator, and 4 new batteries. Is it worth 4 or 5 K blew up. Plus a 1000 tow bill. I think all the new stuff and wet kit is worth the money. It’s 100% ready to roll except for the engine

 

I’ve never rebuilt a 855 but I figured I could get it done. What’s the best I could do doing it myself, I don’t think it’s ever been took apart so I’d probably need the heads cut for the updated liners

 

Or find one in good running condition, change water pump and a few other things while it’s out of truck, install and run until it starts using a lot of oil, then rebuild if needed

 

What would you guys and girls do, I got to make a decision by tomorrow morning

 

Thanks, I like the truck but I don’t want to have more money in it than it’s gonna be worth

 

He says someone else wants to buy it, but who knows might just be trying to make me hurry