What could this worth? 340 block and X head

I got a bare LA block from a friend that we a deal my 71 Duster.

Its a good block and also have what I think the matching X head (complete).

Casting number on the block
AAQA
FW340P30380144
35809
2780430-340-4

I think its from 1969 (baracuda), but unsure, still looking at google for more details
No picture for now.

What these would be worth?