520ci roller cam issue.

Hey everyone, I just got done putting a 520 in my Dart. Here is a little info on build.
520ci with 13.1 compression
Indy Dash one heads and intake
1050 Dominator
The cam is a 740int 760exh solid roller
4.30 gears with 18.5x33x15" tires.
5800 converter (loose) 727 with brake.
Mild steel cage and full square tube frame.
Fiberglass hood and bumpers, the rest is steel with all glass, no plex.
I need a smaller solid Roller cam. I was thinking around 600int and 600exh
I think a smaller converter would work better to.
I am shifting at 6500 rpm and I am crossing the quarter mile at 5300 rpm
with a 1.4 to 1.5 60ft
which translated to 11.20 at 120 mph.
This car I would think should run 9's.
Some one give me an idea of where to get the cam that they would pick for this combination and stall converter size. Also if anyone has parts like a stall and a smaller solid roller and want to sell let me know that too.