Heàds had mild port and flow 260 intake at 500 and 165 exhaust at 500. 1 5/8 full headers 2 1/2 exhaust. 3.55 gears, rpm airgap with Holley 750 but not DP. Mallory all in one dusty, 9.8 compression, tires 25.7 tall. I have the pushrod checker ànd can check clearance when the heads come off. I...