Do yourself a favor if you're looking at aftermarket FE blocks and go with Robert Pond.
I have issues with practically every BBM block I use. Caps numbered backwards, bearing tang grooves cut on wrong sides, thrust surfaces not cut square to block, drill throughs on
oil passages, porosity (
oil leaks as mentioned up above, even had to sleeve a brand new block once), pipe plug holes tapped too deep, etc. I hate to poo-poo on any company providing aftermarket engine parts, but my goodness, I get tired of fixing stuff and then being liable for it when the engine is delivered.
Not that the caps numbered backwards or bearing tang grooves really cause any issues, because they don't, but it just goes to show that there is no QC and the people working on the blocks are not engine guys.....the #1 cap is not the rear cap........