ERA: In-car removal of differential cover?

[Dangerous Doug]

Oh, and I'm pretty happy with my 331 selection. That gives me a 9.6% increase in displacement (347 would be 14.9% increase). I'm sure the 331 vs 347 debate has waged long, but I'd be concerned about sidewall pressure and the oil rings proximity to the wrist pin. My conservative side, I guess.
On the wild side, though, I'm going with a Comp Cams XE274HR hydraulic roller. That and AFR 185's, Edelbrock Performer RPM Air-Gap with a Holley double-pumper ought to do the trick.

[Snakebit]

I changed my dif cover to a Transdapt finned aluminum cover. Had to drill and tap for the vent tube. I had to bend the lip on the aluminum panel to get the cover in. Make 2 studs to screw into the rear housing to line up the cover.