I used a 26/66 cam in mine, you could do a 30/70, I dont know how that would turn out.
Depending on who makes the cam you may need to ajust the valve timing, th 8 valve sproket fits on 3 ways, it'd be a case of trying all 3....with my cam I found it worked best at "C" instead of "A".
This would probably net 120Hp, to get another 10-15Hp a set of 4-2-1 headers might help....as for carbs, who knows I am not a big fan of them anymore as all my cars are injected....but maybe a weber 32/36 down draught.
you could also consider a compression lift, depending on what quality fuel you paln to run it on, you might be able squeeze a few more HP..
use of FE or F8 SOHC 8v pistons, I am not sure on the dish volume on the F2 8v pistons, so I am not sure which ones you should use, except to say using F8 pistons in an FE takes the compression from 8.6 to about 9.5, which means 95RON only....putting them in an F2 on my calculation would mean about 10.2:1 which might be a bit high...probably OK on 98RON...but its a guess.
Do a dyno before and after, so that you can tell if your making gains or not and in the right areas.
84 626 sedan FE SOHC turbo - Sold, no time to finish
84 626 sedan RF diesel - Sold, no time to work on it.
06 Mazda 6 MPS (Mazdaspeed) new fun car no mods yet
07 Mazda 6 MZR-CD 6sp manual - new DD