There were loads of makers ranging from all the manufacturers of course like Diamond Back, kuwahara, GT etc as well as other companies such as IRC and Tioga. Then there were the styles.
Most race tyres were based on the classic 'snakebelly' pattern, comp II (square lugs), or comp III (diamondish shaped lugs).
I'm always amazed by the lack od 'grippa' tyres (83-84ish) as they were quite popular BITD and i'd love a set to race on.
Comp VIII (Comp 8's) are quite good and cheapish I tend to use those for racing