Jonnyj00...100LL Avgas, if you can get, will work great in what you have and be a lot cheaper. My local airport lets me walk right in w/ my gas cans and get as much as I want. I think it's around $3 a gallon.
I didn't even think about using Avgas when I first replied.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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