360 magnum into abody and efi/carby questions

Thanks, I am starting to get an idea of everything I will need.
I did get 360FWHP with that set up. But I did change a few things. I just got a stock magnum engine and
I shaved the heads to get the comp up and installed hughes 1110 springs
had the cam ground at 110 lobes
extractors
edelbrock duel plain with a 770 street avenger.
The 360 FWHP gave me 270 at the wheels through a 46rh trans and pushed my Aussie charger to 13.3 down the quarter. This was the 1st engine I had ever built and it was a very well behaved mild build. The only major problem I had was the lifters did not pump up all the time. I had 60psi oil pressure but it was noisy as hell. I tried preloads from .025 to .060 but nothing helped. I brought a set of mopar performance lifters but they were just as bad. I heard there was a bad batch so I brought another set from a different supplier but they didn't fix it either. So I installed a set of crane lifters and had 6 mechanics look at it for me but still couldn't fix it. I had the engine rebuilt twice but no one could find any reason why they wouldn't stay pumped up. I finally had no money left and installed a solid roller cam.
This was my only bad experience with the magnum engine so I am really worried the next engine might give me the same issues but I don't hear or see on the forums anyone else having any issues like that so I hope it was just an issue with my block. Fingers crossed.
Oh and the other bad thing that I have had is I have used those MLS gaskets twice now and both times they leak oil. I am running some now and I had the heads and deck machined and used a special spray to seal them but the bloody thing are still leaking oil. I wont use them again.