440 help needed

I have an older race 440 motor I have swapped into a hot street '74 Duster. The problem is the 440 has 11.5:1 pistons and angle milled iron heads. I guestimate the CR to be 12.5-13:1. It has a nasty Crane solid cam that specs out at 324 duration (forgot the @ .050 sorry!) and .620 lift, it is a single pattern. It idles at 1500. When I rev it it is like an on/off switch. I have a 4,000 stall JW converter behind it. Now for the questions. *** HOW *** do I get this thing to run on pump gas (93 octane)?

I just bought TRW forged flat tops with flycuts, LY rods, and a forged crank all balanced. I am thinking with the milled heads it will be 10.5:1. Is this an accurate guess? What solid cam should I run to keep cylinder pressure down or with the loose converter do I need to worry about it? Oh, I have 3.91 gears and the car weighs 3400lbs.

Thanks for ANY suggestions!