I've not got the exact same car, Mine is a '67 122S Wagon (P220), but depending on the year it may have the same engine gearbox.
I bought my P220 from a fellow in Houston Texas in 2005 and drove my 1995 945 (tow package-equipped) down from St. Louis to get it. The Amazon had no first gear, leaked/burned about a quart of oil every 200 miles and the front bodywork was rusted-through and flopping free of the nose. I loaded it up with the spare mechanicals from 1 1/2 additional Amazon cars as well as new front bodywork.
So, I drove this car out of metropolitan Houston up to Little Rock, Arkansas then on to St. Louis on state highways. Somewhere around the Arkansas/Missouri Border I lost second gear and later third gear. I was still able to drive it to about 100 miles south of St. Louis, when I decided that I should probably tow it the rest of the way. The state highway between Poplar Bluff, MO and St. Louis run through the St. Francois Mountains...
After renting a car carrier, I hopped into the 945 with my wife and drove the last part "with the hitch." The last 100 miles were trouble free.
So, with a worn-out B18 engine, a leaking/failing gearbox, "wobbly" front bodywork, and loaded up with a spare motor, two spare gearboxes, etc..
So, my long-winded advice is to drive the car. Mine took me 800 miles under an extreme load with a leaky engine and gearbox. If I have not lost those two gears, or had I been on the interstate I could have kept on going in 4th gear all the way home.
After I got it home, I installed one of the gearboxes and drove the car until Thanksgiving '06 when my oil pump finally died - killing the 500,000 mile motor.
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