JB Qwik seems to be holding up pretty well so far. I spread it pretty wide and made sure it was pretty thick right over the hole. I ground down to clean, bare metal and then cleaned the application site with brake cleaner, so I'm confident I got a good bond. I figure when I pull the pan I can clean the inside really good, and then reinforce the patch on the inside; if that looks unfeasible I'll see about getting my hands on a good 235 pan with troughs.
Thanks for all the feedback.
