Good evening Robert. Chris Pring has a J2 which was originally fitted and raced with an Ardun engine. He now has obtained an Ardun engine for it from America. It was fitted into the car by Jim Turnbull, who owns Royal Kustom, and who I recommend.  I would contact Chris Pring first of all, then Jim Turnbull at Royal Kustom. I know Chris Pring's car well and love the sound of his Ardun engine, which incidentally goes very well as an added bonus.