GSK - I just picked up a used Hangar 9 P51 150 with an Evolution GT35 engine.

Yes a great model . throw away the retracts and get some Robarts , they make a set to fit that model , fit 4in wheels and you willl never look back.
By the way ignore the C/G in the instructions , set it back 1 in from the leading edge of the wing tips and your model wil survive a long time with no vices.
There is a long thread on this model atsubscriptions@rcuniverse.
Some of the guys on this thread are subscribers to that thread they may be able to give you a link.

Graeme