Here’s a pic of the foundry mark...... maybe if Zippy sees this thread he can shed a little light on where these were made and about how old they might be.
Also a close up of the port wall texture(they actually “feel” pretty smooth)
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads