Lookin' for 12's

I am running high 11s low 12s with stock small valve J heads.I would try some gear,slicks and tuning before spending big money on the heads.
Heres what I have.
360 9.7 to 1 comp.,MP508/292,single plane int.750DP Holley,10 inch 3500 conv.3.91 gears.weight is 3350.
You are going to need at least 104 mph to get you in the 12s.I think your biggest problem is gearing.Caculating your gear and trap speed I figure you are only pulling about 4600 rpm through the traps.You need to get it up around 6000,this will pick your MPH up to where it needs to be.I would use 3.91 gears with a short 26 inch slick.It will be very streetable with your 28 inch street tires,and with the 26 inch slicks it should get your 60s down and your MPH up.