[andyl]

Thanks to everyone for the comments. Stamping another number is irrelevant really, I could drop a big block in it now and drive to the rego dept and change the number and it would then be on the rego until I get pulled up one day by the inspectors (who regularly have busts around here where they pull over every car and check them).

The only solution I can see is the find the papers one. I know who built the car (DAX) and have even swapped emails with the guy who fabricated this actual chassis, but as to who imported it to oz way back in the dark ages and got it on the road, that was well over 20 years ago now and in WA. The odds aren't great.

I have an old set of rego papers from 2004 from the prev owner and the engine number on those differ even though the one on the reg at time of purchase matched the rego papers. Im not even sure what motor it had in it originally, could be anything.

The old number might not have even been a ford number. It was of the format 6R123456 thats all I know about what might have been in it before. I don't suppose anyone recognises what commonly has a number starting with 6R ?