Best Way to Seal Right Angle Oil Filter Adapter

I'm working on getting my 64 Barracuda ready for the driving season and there are a few things I'm looking for advice on.

1. How to get my right angle filter adapter to seal property. This is my 3rd Seal kit, it is the aluminum adapter set that a member on here graciously sent to me. I did a dry seal install and then tried using permatex in addition to the seals. The permatex seemed to leak less. Any suggestions from seasoned veterans? I'm hoping to eliminate the leaks because it will drop right on the Doug's headers I just finished installing and I'd prefer not to be the guy with the car blowing smoke all over the cars behind me.

2. Gasoline in the oil, a lot of it... I remember when I did my oil change I put in 5 quarts of oil and left at that because I didn't get a chance to run it more than back and forth between driveways. I took out 10 quarts of oil and gas mixture when I drained the oil to put the headers in. I'm thinking it's a carb issue (aftermarket edelbrock 4bbl looks fairly new) or possibly a perforated diaphragm on the fuel pump (which also looks to be fairly new). Which one is more likely in your experience?

3. Dual reservoir brake master cylinder swap. The car has the factory manual drums and single reservoir manual brake master cylinder. I'm planning on swapping to at least front disk brakes down the road, possibly the exploder 8.8 rear end with disk brakes too. Any suggestions on which master cylinder to use so I only have to buy a new one once? The emergency brake works well, should I not worry about the single reservoir system until I do the brake upgrades?

Thanks!