as Arwyn & Andy has said only real way to know is with chassis no & factory records.
but
webers should be 42DCOE
alloy Lawrencetune rocker cover
pipes to and from radiator to flat header tank on bulkhead
oil cooler under rad
4 branch exhaust
alloy body (although not all were)
72 spoke wire wheels
140 MPH speedometer
if you want to PM any info can try to help
