I probably should leave this for the professional engine builders, but I'll put in my 2 cents worth so you'll have a starting point. Crane Cams site says 160 is about the limit on a street motor, pump gas. But I've built motors with a little more c.p. than that and many others have as well. I remember someone on here who was saying he built them with somewhere around 220, then he also said that everything had better be perfect. No egr, no pcv, tight squish, polished chambers, perfect afr, optimum timing, etc., etc.

180 to 190 ought to be acceptable with all the above, keeping squish at 0.030" to 0.035" with a tight piston to wall clearance to prevent piston rock on the pin. If doing a c.p. in that range, I'd make sure all sharp edges in the chamber and top of the bore had a little chamfer on them as well as all the polishing. I'd even take a little 320 paper and work on the spark plug electrodes.

There has been a lot of hoopla lately about Singh grooves. I haven't heard anybody speak negatives about it, even though everybody has his or her own opinions about the number of grooves and placement of them. I have my own ideas of how they should be cut, but will have to wait for dyno results to see how it all shakes out. I don't build enough motors myself to do the research. Some guys point them at the spark plug, others at the far corners of the chamber to pick up some turbulence. Do some research and determine if you'd like to copy someone else's patterns or determine them yourself, or if you even want to mess with it at all.