hey guys i am new here, i am from south africa and i am currently busy restoring a 71 chev c10 pickup .. i need some help identifiying the small block motor that is in it because some people say i have a 283 and others say i have a 327 so i am a bit confused .. hope you guys can help thanx in advance

castings on the block
3858180
A2884
4T

casting in head
3795896