See how much he wants for the whole car and then part the rest out yourself. 150k is a hell of a lot of miles on a trans, I'd assume it would need rebuilt. If you get the whole car that means you'll have all the parts right there and not be like "oshi I missed that stupid XYZ part". You can keep the auto computer but will throw lights on the dash which you can just ignore. Or just install the T4M0.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.