8.4 if you dont wanna a "fussy" motor is fine.
You have bozos telling you what they've run but I'll just tell you what works not about what I run because what I run might not be what you want to run but basically anything after 8.4 dynamic becomes a delicate animal on '91 octane' . Whatever the instructions for the Piston Ring Gap say I would probably add another .005 to it for good measure.
So if you're going to get them at say .029 to .030 ...may as well just go .034
When hyoereutectic pistons are exposed to pre detonation and damage themselves... you'll hear a clack noise upon said predetonation. There's the typical ping but with these there's not much of that before you get to that clack and that's a ringland coming off as you do with too tight a ring gap. Say you have one cylinder that's lean and lightly touching pre detonation and you don't really hear it but it gets that cylinders piston and ring even hotter than normal and the 'just enough' clearance becomes not enough..then it pops a ring land and gets into the valve or closed chamber then the entire piston SHATTERS...that's kind of where I'm going with that.
So 8.4 is great.
If the Cam's the right cam I would put it in straight up too if it closes at 35 or 36 make it close there.
If you want to get tricky like some of us who account for chain stretch you could put a degree or two into it remember those timing chains stretch ...and when they do..they retard.
