Ospho went on Saturday, and had blackened the trunk floor by today. Waiting on a quart of POR silver to arrive tomorrow. Various accounts I've read since say those two are incompatible for good adhesion, but I wanted to see if any of you guys had used the Ospho/Por combo successfully.
On the mechanical side, found a pretty substantial pooling of gas on the intake, traced back to a split in the accelerator pump diaphragm. Replaced the diaphragm, and that appears to have fixed the issue. No other leaks at present, but it's a Holley 4166 and I've heard some scary stories that have me waiting for the other shoe to drop.
The adventure continues.