I dont want to dig up the thread,But Alex,the bevel 13b n/a rotors on rx7club..
theres very good pics in there.

I doubt Jeff got his rotors from a junk yard.
Go here to get an idea on what new rotors cost,theres no rennesis ones listed,but get the idea.

If you plan on rebuilding your engine,Dont expect for outragous HP gains.I doubt you will see over 220 rwhp.Maybe 200 ish

If I was going to do a 6 port and stay FI.
Some sort of port work,intake/exhaust
throttle body/intake porting
fuel pump
550 primaries/680 - 720 secondaries

ONLY with a AFC or standalone.
I think a standalone is overkill on a n/a set up.

and 2 of the big bottles