Ok, I bought me a 86 mustang with a 306 carb engine. Holley 4 bbl, edelbrock performer air gap intake, gt40 heads with comp cam alumi saver roller rockers 1.6, edelbrock long tube 4 to 1 headers into single chamber flows. That being said I purchased the car with an overheating problem. The radiator, water pump, thermostat have been changed. Also replaced junk heads for gt40's with nice rocker set up thinking heads where just warped. Still overheating, Could it be a air pocket? Could it be a bad radiator? Or most likely is it the block at this point? And if it's the block what's the best bet for a new short block for my set up? Mostly to drive and enjoy but some street/track stuff.