Post pics of your v8 RX7
That being said, the ls7 head design is pretty dang good.
If I ever had to replace this motor I'd go for the ls7.
My engine is a pretty good build and put down 540rwhp on crap 91 octane. I've seen a lot of c6zs that have way less work than my motor do more than that in the same fuel
The ls7 dry sump wont fit in a FD with major pan modification. Soooo you can buy an ls7 and 'de-ls7-it' a bit then run it, but there are many other issues etc. I would recommend to get a RHS block if you want big cubes.

























