fuel question regarding octane and ethanol

[kevmcrae]

I have a 71 with a 79 454. Has been built up a bit with overbore .30, pistons, roller rockers and a extreme cam. Previous owner built the motor and said it runs fine on 87 octane, (regular). I haven't had any pinging. I have been reading a lot about how ethanol destroys fuel systems in the older rigs that weren't designed for it. As well as it causes the fuel to "spoil" much faster than normal especially the way I drive it, weekends only. I know I can use Stabil to help with keep the fuel fresh. But I'm really concerned about the ethanol hurting my entire system with corosion. Anybody have any experience or advice?