I have accumulated a number of 1963 / 68 chevy 327 parts. I'd like to put some of them together. Will they match up?

Block #3782870
Cylinder head # 3782461
Intake manifold # 3844461  

wow.. i googled this

http://www.google.com/search?hl=en&q=Block+%233782870&btnG=Google+Search&aq=f&oq=

seems you might have a very desirable block...  for corvette restorers... depends on what the stamped in numbers on the front right deck...

just for kicks... i googled the intake also... seems there is one on ebay for 700 bucks..

seems that you have a pile of gold there...    you putting to good use in a restoration...   or a superchevy of some kind..    you might be able to trade or sell them off to some restorer and buy a really nice mid range complete gm crate motor...

other than that... yes they will all fit together...   try not to let the machine shop mill off the stamping numbers on the right hand deck.... if you plan on having it decked... as many ***