l've been hearing so much about swapping heads and running into difficulties, but l also read about a head and headers swap on a 305 in car craft or hot rod mag, l think it was, they didnt seem to mention anything about the computer needing to be recalibrates, so whats the bottom line? does it actually need to be recalibrated with a speed density system? l havent got the resources to recalibrate the computer, but l can easily swap the heads, will the car even run after a head swap? l'm thinking about going with world heads, and edelbrock TES headers, any suggestions on the swap, the computer recalibrations would be appreciated greatly,

thanks a lot

 

Speed Density with new heads means a new chip, or it will run like crap.