maybe buy a long-block
(crate engine, I hate that term)
from one of the many suppliers
someone like Mancini Racing
or BluePrint Engines
or maybe even someone like
www.440Source.com
or many others
That may end up being the better way to go
instead of searching for old worn-out stuff
paying all the shipping from parts god knows where
& 'god knows' what real kind of condition
until you get them in hand
& being a crapshoot/gamble on what you get,
Then still having to send it to a machinist
(be in machine shop jail for months)
& still buy all the associated parts...
Happy MoParing
Good luck
you're in the correct community
you'll get many different answers too