distributor keep failing 3 in one year going on 4th

Sounds like your coil is having the issue.

Pertronix electronic conversion kits worked the best for me. No more points and or using of feeler gauge was really nice. Throw in their "flame thrower" coil for good measure.

Everything comes in the kit, best to use a magnetic screwdriver if you don't plan on dropping a screw down the distributor. I know this conversion may seem "high performance" but it is reliable and effective, startups are also a lot faster as well.