I have been futzing with a Speedster that has a Type I turbo and FI motor.
www.jbugs.com is good, so is Mid America.
http://www.marksbugbarn.com/ has some good stuff as well.
A 1500 sincgle port IF it's a Type I, was a 67 bug motor. They also made them in the pancake design and used them in the squarebacks and some busses.