79mustang302

Quick Question:

I have a 1979 Mustang with a 1986 5.0 motor.
Mods are as follows:
Holley 650 4 barrell
Long tube Headers
Flowmaster
3 inch exhaust
8.8 Ford rear axle
3.73 posi gears
MSD Coil, Dist Cap, Wires
Weiand Intake
C4 Automatic

My question is I want to go faster/more hp out of my 302.

What else can I do before getting too deep?

What cam/heads do you recommend

Also, should I upgrade to a digital 6 ignition? Always see them but never used one.

Thanx,
79mustang302