Aluminum heads or full roller valvetrain?
I've got a 67 300 Custom Deluxe that weighs about 3300 lbs...not sure if that's with or without 180lbs of driver. I'm running a 355/350 combo with 4.11 gears on 28x11.5 slicks. It's a 4 bolt with cast crank and stock rods. I'm running H631CP hypereutectic pistons. The cam is a flat-tappet hydraulic 280H grind from Comp Cams, so .480 lift. Heads are cast iron Vortec with 64cc chambers and 1.94/1.50 valves, ported and polished with a 7 angle valve job, screw in studs and guide plates, and roller-tip rockers. Deck height is either .005 or .008, but my notes conflict on this. Current compression ratio is either 10.52 or 10.60:1, depending on which of those numbers is accurate. I've got a Performer RPM Air Gap manifold with a 650 CFM Holley prepped for racing by AED. Standard HEI ignition, cheap-ass headers and the biggest damn mechanical fuel pump I could find. I run on 93 octane pump gas.
I shift at 5000 RPM. Good 60' times are high 1.7s but it's usually in the low 1.8 range. 1/4 mile is 13 flat in the dead heat with the car warmed up, closer to 12.80 in good air. Trap speeds are usually in the 103-104 MPH range.
So...should I go full roller valvetrain or aluminum heads? My gut feeling is that some good AFR or Brodix heads would probably be the way to go. I'd like to get down around 12.50. I definitely don't want to go any quicker than 12.00 flat, but I doubt that I'm in any real danger of getting near that. I wouldn't mind bumping up the red line closer to 6000 RPM. I used to shift at 5800 when I ran a Muncie. I'm also guessing that a cam swap might require a bigger carburetor. Thoughts? Recommendations?