tyrell p34 123

Hi All i have a 1:10 scale Tyrrell P34 kit No.RA1003 i got this from my grandfather when i was a kid, I'm trying to get it running but am struggling to find out exactly what i have, from my research i found it could be a older model from around 1977 reason is based off the parts it has in (i.e the older steering block etc.) from photos i could find i am based in South Africa so seeking someone to help/ advise on maybe finding parts or getting in running, at some point i had it driving but the steering block/ mechanism is giving problems i would like to keep it as original as possible, and get it on the road to hand over to my son, so it has some sentimental value i am not really to concerned about the actual value of the product although it will be interesting if someone might know any advice will be greatly appreciated