As other have said, the mixture will degrade old rubber and will strip any build up out of the tank and fuel lines. This will plug up any fuel filter you have.
Last year I purchased a '68 Amazon in the UK and had it shipped over to the states. It ran fine for the first couple of tanks of gasohol (90%-10%). The mixture then destroyed the old fuel pump on the car. I changed that out (after trailering the car home) and then it started to plug stuff up. I was packing stuff into the fuel pump and filling up the filter (trailered home a few more times). It was a real headache for a few hundred miles. I finally pulled the tank and had it caustically boiled clean. I also ran duel fuel filters since then (coarse upstream of the pump, fine down stream of the pump). Car runs fine now and I will go back to a single fuel filter shortly.
Good luck.
Chris
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