Thanks all for the comments. Yeah, the gas tank is really nasty. In the process of draining to see if it can be sealed. Ive done the tanks in a couple of old Fergusons with good luck.
Don't think I was mashing the starter pedal hard enough to get past the natural stop at the solenoid or whatever the gismo is on top of the starter with 3 wires going distributor.
Is it something to do with the reverse polarity??
Tom B