New Update! Just picked up my old heads from the machine shop and now he tells me they are 305 4-barrel heads with 184(?) valves and 63cc. He said it is the same head he runs on a dirt track car. The number between the valve springs is 864434. Does anyone recognize those? On the other end of the head is GM21T. The machinist recommended putting 194 heads back on it. But it ran fine with the heads that were on it, so I don't know what to look for now, 194 or 305 heads. Motor is totally stock. HEI ignition and edelbrock 600 carb. Stock exhaust manifolds, intake, cam, etc. Has a turbo 350 auto. Plan on bumping horsepower up in the future, just can't afford to right now. What do yall suggest?