Yeah, I've heard the 91 in CA is pretty piss poor. In that case, I guess it may be worthwhile. That's a pretty big price diff. Around here, saving .50 wasn't justifiable. I have pinging issues I'm sorting out now as well, mostly due to timing and using a sh!tty aftermarket HEI that brings the timing in way too fast, and has too much mechanical advance for the heads I'm using with a useable intial advance...still working that out.
One very nice advantage to the E85 is that it burns really cool. You won't have any heating issues whatsoever. I was running a stock radiator with no shroud and a crappy flex fan. Now that I'm on gas, I had to buy an aluminum radiator with dual SPAL fans and shroud, etc. and I'm still around 205*. I never got over 180F before.
I'm at 10.5:1 with aluminum heads. Pontiac's run hot, so I guess I'm fighting an uphill battle now.
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1969 Firebird, Black w/Parchment Arizen interior, 383 Pontiac Stroker (350/428 crank), TKO600, Moser 12 bolt, 18" TTII's, Hotchkis, GW, DSE, Speed Tech, Vintage A/C, etc.
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