My old man just bought an 66 F250 tow truck with a 300 cubic inch six and 4 speed box.
anyone know much about these motors, all ive been told is that they are a stroked 3.7 litre and they are pre cross flow.
any info would be appreciated he wants to do the old girl up a bit.

Google will provide you with much more detailed information than anyone here can.
That motors been played with in the states a lot more than here, and you'll find a few forums with some good info.
http://www.ford-trucks.com/forums/40851 ... i-6-a.html
Heres one with a good result.

They a basically a big block version of the pre crossflow. Very common in the USA and Canada.
Head over to www.fordsix.com

thanks fella's