Trying to figure out what is holding it back from better et's. Car is a 1981 Dodge Mirada. If I had to guess weight is 3500lbs, never weighed it. 8 3/4 with 3.55s running mt et street radials 275/60r15s , 904 low gear set and 3500 stall foot brake to 2500 launch. Engine is 408ci. eagle crank and rods, kb hyper pistons, comp cam hydraulic roller xr-292hr-10 duration 242/248 lift .545, 1.6 ratio rockers, edlebrock rpm heads, airgap intake, and 750 Holley dp. Car is consistently 12.20-12.30 @108-110mph. That's shifting at 5800 rpms, which is what it liked. I was happy with it, but wanted to go faster. therefore send the heads out and have them cnc ported and 2.08 intake valves put in. put the engine back together and car is still 12.20s-30s. Thinking I should look into a 950 carb. Am I looking in the right direction?