CC'ing the heads is a huge help. Next up is making a free flowing 2 1/2 inch exhaust system out of mandrel bends. I bought the pieces I needed from JC Whitney. Pop rivet them in place, then take the pipes off the car and have them welded. Clamps are heavy and crimp the pipe. You don't want that. Stainless Dynomax are the best flowing mufflers and reasonably quiet. An X pipe somewhere in the middle works wonders helping exhaust flow and keeping the noise down at the same time. Heat risers are nice for warming your car up in the winter, not so much at the track. Make sure your carb throttle plated open fully, even if you have to take out those pretty accessory floor mats you just paid 75 dollars for. Another thing, stereo systems won't make a car go faster, no matter how much they cost. Weight is your enemy, unless you need it in the trunk for traction, but that's not often necessary when using reproduction Goodyear or Firestone bias ply tires. If you thought radials were expensive, wait till you price those bias plys. Wow! G70 15's if your car had 15 inch tires as an option, if not, G70 x 14's is second best. If you wanna get serious, retard the stock camshaft 2 to 4 degrees. That will kill off low speed tire spin and add to the top end power.
If you have cowl induction, anything you can do to get more cold air into the carb helps. Try to cut down on the air flow into the car through the dash air vents. Whether that's legal or not depends if anyone notices it.
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