4the48granny

350Lt1 block clean would need bored
Heads for above - would need some machine work
Exhaust manifolds for above- good shape $600 for all

shoebox

There is a for sale forum around here, somewhere... I'd expect you will need to cut your price in half or more to sell.

Catmaigne

The block is probably worth around $150 on CL if you can find someone who only wants a 2 bolt.

Nobody wants used cast manifolds. The frustration of drilling out the sheared bolts isn't worth the effort when you could just buy some headers.

Are the heads aluminum or iron? If they're aluminum and a desirable casting (643 or 374) then you could get a couple hundred for them.

You're out of luck if they're not. I've had these iron LT1 heads sitting on my shelf for a few months now and nobody wants them. Not even @ $40 for the pair.