Yes it is a Toyota, I think it is out of a 85' Landcruiser... but I'm not positive. Are they any good? I know everything is backwards, manifold is on the opposite side. He only wants $600 for the whole truck... motor running gear and frame are good.
From what I've heard they're typical toyota. It'd probably be a cool addition to your ride, and if you turbocharged it it should make plenty of power and be very reliable, not to mention way cooler than the standard 350 swap.