My suggestion, and also what worked for me on my 440 pan. Right Stuff sealer and no gaskets. I used the small calk gun and 2 refill kit they sell. Also a Chevy BB oil pan stud bolt kit. Working time to get it assembled with a windage tray is like 10 minutes. So I would recommend a dry run one time to memorize motion to get pan up around the pickup and in place in one smooth motion without bumping into anything where the sealer will be.

I put studs in block, then sealer on the pan and then crawled under and did the block, then windage tray on. It will stick up there. Then the pan on.

Good luck!

Also if you need suggestion for rear main side seals. For side seals I left them out and filled with Gray RTV. I filled the side seals by using a 10 ml syringe and 10ga luer lock blunt tip needle (when in the car and converter attached).