Here are two 360 combos that i have run. Very similar cast piston short blocks but different hydraulic cam and different converters. The bigger cam as expected needed a looser converter. If I was going to do the 360 in the Duster over I would stick to a 224@.050 cam with a 108 or less lobe separation like I had used in the Valiant but with a looser converter then the Valiant.The other difference is transmissions (727 Duster) (904 Valiant). Below I copied and pasted 2 of my previous post.

This is my Duster,
Finally got the Duster into the 11's. After I lost first round cause I sucked driving the finish line I decided to take some weight out of the car and see if I could get into the 11's. I weighed the car before the 1st time shot 3,495lbs. with me in the car. 1st. t/s the car went a 12.182/109.57 2nd. t/s 12.180/109.79. 1st. round 12.137 on the brakes was going a 12.12 something going off the 1000' so I didn't kill much. As I mentioned I sucked driving the finish line cause I was .004 on the tree. Anyhow since I had lots of time to kill I took out the spare tire and the 50lb. plate that I had under the tire along with all the hold down hardware and went up and made a t/s the car went 12.022/110.81 with a so far best 60' of 1.640 I weighed the car after the pass 3,390lbs. Next I took out the pump spray bottle from behind the seat and a small toolbox and I cooled the car down to 105 degrees go in the water at 125* and the line at 135* the car went 11.943/111.80 and 1.634 60' weight after that pass was 3,370. It's not bad for a cast flat top 360, 9.9 compression, 232/237@.050 hyd., mild pocket ported 2.02/1.60 J heads, LD340 vac.750, heddman 1-5/8" header, 3" summit exhaust with dynomax ultraflows, point's dist. with a super coil, 3.91 gears, 255/60/15 M/T drag radials, 727 trans.. It gets driven on the street but not to far because I have a water pump drive on it and an 8" converter right now. Any suggestions on making it go faster without spending money are welcome.

This was my Valiant,
My 360 started as a .040 over Napa rebuilt short block. I took it apart to check everything. I had the block decked (deck .015 head 63cc., gasket .028, compression 10.51)reversed the cast dished pistons on the rods and put in good rod bolts and had the rods resized. I put in an old Manley cam that I had. 443 lift 224@.050 I don't remember the lobe seperation but I think it was around 108. I used J heads pocket ported with 2.02 int. valves and 273 adj. rockers an LD340 intake with a 1" 4 hole spacer and a Vac. 750. For exhaust I used heddmen 1 5/8" headers, 3" exhaust with ultra flows ending at the axel. I used a 904 with a Dayco 2,400 stall converter and an 8 3/4 with 3.91's the slicks were 8"x 26"x 14". Suspension consisted of 6yl. bars and comp. eng. adj. shocks in the front and 002/003 superstock springs with Mopar perf. 50/50 xtra long shock in the rear. The car was a 70 Valiant 4 door it weighed 3,320 with me in it. With an electric water pump drive, 5/16" fuel line with holley mech. fuel pump and a homemade fresh air intake (dryer hose and a dual snorkle air cleaner)the best run was 11.96/113 but it typically went 0's and teen's in decent air at Atco and E-Town. Typical 60'was low 1.70's. With a looser converter maybe around 3,500 stall it probably would have gone 11.70's or 80's.