Need Help with Oil Pan Gasket Leak

[derotoreut]

So I finished my 5.3L LM7 4L60E swap on my 70 K10 in the early summer. I drove the truck over the summer, but over time I was getting more and more dripping from around my oil pan. I rechecked the torque on the pan bolts and tried to snug it up a bit, but I think I may have made it worse.

My oil pan is one fabricated by Tilden Motorsports and should be a good pan. I tried to remove the pan, but even after jacking up the front of the engine I can't get it out. In order to get the gasket out I had to finagle removal of the pick-up tube with the pan dropped, but still in place. It looks like I'll have to replace the gasket with the pan resting on the cross member.

Looking at the pan, it appears that it may not be perfectly flat, but I can't tell for sure. I can't get any type of straight edge in there to check. I'm pretty much stuck using it, because I can't get it out. My question is are there any options for sealing it up better then the stock gasket. From what little I know, the stock aluminum o-ring style gaskets are supposed to be pretty good. In my case I had significant leaking mainly at the rear by the bellhousing. I also had leaking though at the front. Too much just to let it go. Any help is greatly appreciated.