Up Grades on Stroker-Suggestions

Want to do some up grades on the stroker in the Duster, heres the current set up

Stroked 360 with 4" forged crank
H beam rods
J E forged pistons
Balanced with zero deck
Out of the box Eddie heads
Crane Gold 1.5 rockers
Mopar Purple Cam 528, Add Dur 284, Dur @ 50 241, Lob sep 112
Mallory MSD ingnition
Headers are Hedman running through a 2 1/2 twin with Edelbrock mufflers
Edlebrock STR 1-2 cross ram with 450 Holleys with rear metering plates fitted, main jets 64, secondary jets 63, timing is 33 deg, rev limited at 6150.

Running 727 full manual reverse patan with 11" stall set at 3500, rear end is 8.75 with true-trac 3.91
Weight on the Duster is 3150
Max power at rear wheels is just shy of 300, torque is just over 400NM

This car see's street & strip duty & I feel there is more in it. I know the extuast is one area, I don't want to change the inlet as you dont see them in Oz at all.

Would I get an addvantage in up grading to TTI headers, 1.6 rockers & a smaller converter something along the line of 8"?