My 64 220b really like 75 more than 65. It got quieter and smoother at a higher rpm. I had it up to 100 on plenty of occasions. My 450slc is top speed limited by the 3.69 gear I have in it with a 4 speed Manual and no overdrive. I've had it maxed at near 130mph. Rock solid. The suspension is pretty highly modified but I don't think it would feel unsafe in a good condition stock 107 chassis. I've drifted it at 80+ mph on Pocono infield south course and Jefferson circuit at summit point raceway as well.

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