I would never use 87 in any type of hod rod its just pointless,,,,use the good stuff 93+,,87 can and will cause spark knock,valves to rattle,,,etc... now a computer controlled vehilcle like all these new cars and truck its ok ,but the old stuff and built motors usually over 9 to 1 compression "need" higher octane,,,if you want power keep the compression up but you have to run good gas...try aviation gas its 100 octane and here in Tennessee its just $3.20 a gal also make sure you use good spark plugs,,you cant go wrong with Iridium plugs