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Buz;
The battery negative side hops over to the chassis, and then, (look for it down low) unless it was somehow lost (in which case you'll need to reestablish it), I expect there already is a braid attached to chassis, which hoped over to the old engine (I'm no 444/445 expert, so others will have to chime in with the exact location)...if it's long enough to make it to the new engine and bolt on securely, OK, if not, you can relocate and/or lengthen...the important things are it needs to be fastened securely, and the connection MUST have a vibration loop to allow for engine movement.
For guage, I would expect 3/8" dia. wire (guage?) or equivelent braid to handle the currents fine.
You mention this is a 6 to 12 volt conversion also...so further info here may be helpful: http://www.intelab.com/swem/Vintage_Volvo_6V_to12V_conversion.htm
Finally, Mike and I have had this discussion before....but Zinc Anti-Corrosive Paste is the RIGHT thing for eletrical connection on your ground-straps...or ANY other electrical connection for that matter...and better than petroleum jelly... because Zinc Anti-Corrosive Paste prevents electrical problems by TWO mechanisms, chemical corrosion neutralising by Sacrificial Anode AND GAS-Tight-Joint....not just by keeping out moisture and keeping in contaminants and which most definately are there already (unless your car was built in a clean-room of perfectly clean parts). Read more about it here: http://www.intelab.com/swem/anti_corrosive_paste.htm....
Cheers
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