I have a 72 small block 350 Corvette motor that had a basic engine rebuild. Stock pistons, stock heads, stock cam. The only mods are a streetmaster manifold, holley 600 and I put a Hei distributor on it. I timed the motor to 8 degree btdc and it seems I have hesitation on my take offs , but at about 3500 to 4000 she really takes off. I had the timing way off like 14 btdc and it seemed to run better. I shot the timing and plugged the vacuum advance when I shot the timing and plugged the hose to carb. I'd like my acceleration off the line to be more responsive. Any suggestions or advice or insults appreciated.