I have used glycol coolant and have not had any problems. For a throttle pedal I adapted a later Chevelle style pedal that bolts to inside of firewall. Just had to weld a flat plate in the proper position to mount it to. Used a Lokar universal throttle cable to run from pedal to throttle.
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Steve
71 Pontiac GT-37 400 4 spd (sold)
71 Formula 400 turbo 400 (sold)
01 Firebird T/A WS6 auto (fun)
64 Tempest Post car LS1/4L60E (Love It!)
65 Lemans Post car LS1/4L60E (More Fun)(sold)
73 Lemans GT 400/auto 1 owner 52k miles
69 El Camino LS1/4L65E (Awesome)
70 Pontiac GTO Convertible 400/400 Original
69 Olds Cutlass S W31 Numbers matching 4Spd 3:91 one of 569
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