8.8 is kinda slow for that motor setup, what did it trap? I’ve been 8.3 at 86 with my L28ET with street tires and an open diff.
SBC alternators are pretty simple, decent connection from the terminal to the battery and battery voltage at the sense wire should do it. If you’ve got that and it doesn’t work, get the alternator tested.
Got a new alternator, just wanted to thank john for the metal wire holding the cars body harness to the brake line, the vibrations caused it to chew through the insulation of the wires and cause an electrical fire. That was real sweet considering it was hidden underneath the exhaust wrap on the harness.