Help with engine stud kit

My build is finally progressing. Been way too long, but you play the hand you're dealt.

I am converting my stock four port to a six port. I want to reinforce the block as much as possible, but have gotten conflicting advice from a lot of people. I would appreciate any input that can be provided. My goals for this project were never to make huge power, but if upgrades need to be made, this is the time.

Option 1: add two additional Mazda dowel pins

Option 2: add five 12mm studs (some machining)

Option 3: replace all tension bolts with 10mm studs (no machining)

Option 4: replace all tension boots with 12mm studs (lots of machining)

Thanks for your help

Help with engine stud kit