I found no differences with the head....as for the cam I could find no difference.....timing was not a problem,,,,as for the real seal, yours may have been upgraded to the rubber seal....I used the Graphite seal as the crank still was knurled for graphite. I should have polished the knurls out and used the rubber, so far no leaks.
The only problem I ran into was the engine was tight to turn over with the graphite seal, 12 volt into a 6 volt starter cured that...now the whole car is 12v.
Franikie47...a generic block to me is a the same long block that is used in a series of applications. The difference is what is bolted on to the block...ie....manifolds, starter, flywheel housing and such.. That is the beauty of these engines...so versitile.