Thanks to all for the reply!!

Will try to post some pics by this weekend. My 73 has a 4.3 with a 350 trans and the 79 is sans a motor right now. I have a 327 on hand for it. The 77 just has the motor I was trying to discribe. There are some letters on the oil filler cap and cast on the block in a few places. They are what looks like the letters TER and a backwards "L".
My other cars are a 1967 camaro that my wife has had since her 16th birthday she is 45 now, a 1991 RX7, that I need a fuel pump for, and my baby, a 2000 Mercedes C-230 Kompressor.