I would build the 302 and stroke it, and run the Cleveland heads with a differant intake.
They call them clever engine's now. But back some 30 years ago we called the Mexican style Boss's. In my experince they are very hard to beat. Summit has a good C - 4 they sell but with that kind of HP The regular C - 4 with a shift kit won't stand up.
Like Dave Severson said C - 6.
Kurt