Air/ fuel tuning

firstly where can i buy the idle feed restrictors , mine has allen key head ones.
its a kb carburetors carb? any opinions?
so the carb was built to suit and then dynoed so i dont want to get too over my head.

was cruising on the freeway today, and at 60mph about 3100rpm, cruise was always min 12s maybe even low 12s so after about 100kms , i decided to try a smaller jet .
put in a 76/86 combo now.
cruise changed to 13:1
but for WOT
cruising at 3100rpm , then full throttle
i get 14.5 approx , but after 2 seconds of WOT it drops to a safer 12.5.

should i just put the 78's back and leave it or ???

vaccum is around 10.5at idle