[RACER X #99]

Unless you are going to run electronic FI, I would go with the 9.6-1 pistons. I can show you a set of 10.5 -1 pistons that came out of my 408 running pump gas.
You may be able to get by on the street with those pistons but if you ever do any serious track time you will get serious preignition unless you are running 110 octane race gas.
I know a lot of guys will tell you you can run 10.5 on the street without race gas and maybe you can but almost all track cars with that comp. are running race gas.

I argued with my engine builder when he said run race gas and I told him lots of guys on Club Cobra run that comp without any troubles. I didn't listen and I had to replace all pistons within 1,000 miles.

Check the compression of any new high performance cars and see how many are running 10.5-1 ,and also check how many are running a carb.

RD