The Datsun 510 guy was me. I never owned one, but always liked them.
Like I said, I was there for a a lot of SS racing, and know what I saw. I owned a Vega, autocrossed a Vega, and wanted to see a Vega win every SS race I watched. It didn't happen. The Vega's did well, as did the Monza's later on, but they didn't run away from the pack, not ever. I took auto-x damned seriously. The custom alignment, Koni shocks, "R" compound tires, a 6 point roll bar, and every engine trick I could legally squeeze out of that ugly little 2300. I didn't half ass it, and that's probably why I get hot under the collar when debating with him. My Vega was probably as well set up as any that ever ran in H/Stock, and won a lot, but equally prepared BMW's, 510's, and later Honda Civics gave me all I wanted.