Spins over by hand just fine - well, as fine as a 10:1 engine can, anyway.
I got nothing then. Providing cabling is sufficient to deliver the battery to the solenoid, solenoid to the starter, providing the grounding is as you say, and providing there isn't a big ol Jimmy Blower sitting on top of that 350 stuffing it up to about 12:1, I dunno what else to tell you.