Interesting point DavidC makes, so I checked my own car. My '73 411/3 has a voltmeter, albeit a slow-reacting one. As a precaution I'd renewed the separate solid-state regulator at the time I fitted the Sniper. Alternator looks original-ish and there's no sign of an upgrade or replacement in the history file.
I checked the charging with my voltmeter, and with fans on (and electric fuel pump obviously) it charges at 12.75v (shows just over 13v on the dash gauge) and 12.25v with the headlights on main beam, as well as the fans. Normal running shows c.15v on the dash gauge, which reads a bit high in relation to my multi-meter. Exec summary: it seems to work.
Referring to David C's earlier post about intake manifolds I experimented by trying my car without the (Holley-reccomended) divider-less Wieand sealer plate between the stock cast-iron spreadbore divided manifold and the square bore Sniper. I used a gasket with a divider strip. It ran ok at first but soon developed an air-leak that I couldn't cure so I went back to the original setup of open sealer plate with a gasket above & below, and it's running fine again. Whew....
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